Merge branch '18193-no-one-can-push' into 'master'

Allow creating protected branches that can't be pushed to

## What does this MR do?

- Add "No one can push" as a setting to protected branches.
- This applies to Masters (as well as all other users)

## What are the relevant issue numbers?

Closes #18193 

## Does this need an EE merge request?

Yes. gitlab-org/gitlab-ee!569

## Screenshots

![Screen_Shot_2016-07-29_at_3.14.59_PM](/uploads/2e8774c311763bc6e570501a2e6cabf7/Screen_Shot_2016-07-29_at_3.14.59_PM.png)

## TODO

- [ ]  #18193 !5081 No one can push to protected branches
    - [x]  Implementation
        - [x]  Model changes
            - [x]  Remove "developers_can_merge" and "developers_can_push"
            - [x]  Replace with `ProtectedBranchPushAccess` and `ProtectedBranchMergeAccess`
                - [x]  Reversible migration
                - [x]  Raise error on failure
                - [x]  MySQL
        - [x]  Backend changes
            - [x]  Creating a protected branch creates access rows
            - [x]  Add `no_one` as an access level
            - [x]  Enforce "no one can push" 
            - [x]  Allow setting levels while creating protected branches?
        - [x]  Frontend
            - [x]  Replace checkboxes with `select`s
    - [x]  Add tests
    - [x]  `GitPushService` -> new projects' default branch protection
    - [x]  Fix existing tests
    - [x]  Refactor
    - [x]  Test workflows by hand
        - [x]  from the Web UI
            - [x]  When "Allowed to Push" is "No one"
                - [x]  Developers can't push
                - [x]  Masters can't push
            - [x]  When "Allowed to Push" is "Developers + Masters"
                - [x]  Developers can push
                - [x]  Masters can push
            - [x]  When "Allowed to Push" is "Masters"
                - [x]  Developers can't push
                - [x]  Masters can push
            - [x]  When "Allowed to Merge" is "Masters" and "Allowed to Push" is "Masters"
                - [x]  Developers can't push
                - [x]  Developers can't merge
                - [x]  Masters can merge
                - [x]  Masters can push
            - [x]  When "Allowed to Merge" is "Developers + Masters" and "Allowed to Push" is "Masters"
                - [x]  Developers can't push
                - [x]  Developers can merge
                - [x]  Masters can merge
                - [x]  Masters can push
            - [x]  When "Allowed to Merge" is "Developers + Masters" and "Allowed to Push" is "No one"
                - [x]  Developers can't push
                - [x]  Developers can merge
                - [x]  Masters can merge
                - [x]  Masters can't push
            - [x]  When "Allowed to Merge" is "Masters" and "Allowed to Push" is "No one"
                - [x]  Developers can't push
                - [x]  Developers can't merge
                - [x]  Masters can merge
                - [x]  Masters can't push
        - [x]  from CLI
            - [x]  When "Allowed to Push" is "No one"
                - [x]  Developers can't push
                - [x]  Masters can't push
            - [x]  When "Allowed to Push" is "Developers + Masters"
                - [x]  Developers can push
                - [x]  Masters can push
            - [x]  When "Allowed to Push" is "Masters"
                - [x]  Developers can't push
                - [x]  Masters can push
            - [x]  When "Allowed to Merge" is "Masters" and "Allowed to Push" is "Masters"
                - [x]  Developers can't push
                - [x]  Developers can't merge
                - [x]  Masters can merge
                - [x]  Masters can push
            - [x]  When "Allowed to Merge" is "Developers + Masters" and "Allowed to Push" is "Masters"
                - [x]  Developers can't push
                - [x]  Developers can't merge
                - [x]  Masters can merge
                - [x]  Masters can push
            - [x]  When "Allowed to Merge" is "Developers + Masters" and "Allowed to Push" is "No one"
                - [x]  Developers can't push
                - [x]  Developers can't merge
                - [x]  Masters can't merge
                - [x]  Masters can't push
            - [x]  When "Allowed to Merge" is "Masters" and "Allowed to Push" is "No one"
                - [x]  Developers can't push
                - [x]  Developers can't merge
                - [x]  Masters can't merge
                - [x]  Masters can't push
    - [x]  Add tests for owners and admins
    - [x]  CHANGELOG
    - [x]  Screenshots
    - [x]  Documentation
    - [x]  Wait for ~~!4665~~ to be merged in
    - [x]  Wait for ~~gitlab-org/gitlab-ce#19872~~ and ~~gitlab-org/gitlab-ee!564~~ to be closed
    - [x]  Rebase against master instead of !4892
    - [x]  Make sure [build](https://gitlab.com/gitlab-org/gitlab-ce/commit/a4ca206fd1cc0332d1e385ddbc0f2e4065c3ae73/builds) is green
    - [x]  Create EE MR
        - [x]  Cherry pick commits
        - [x]  Make sure [build](https://gitlab.com/gitlab-org/gitlab-ee/commit/4e17190d7dc546c1f977edcafd1cbcea4bdb4043/builds) is green
    - [x]  Address @axil's comments
    - [x]  Assign to endboss
    - [x]  Wait for @dbalexandre's review
    - [x]  Address @dbalexandre's comments
    - [x]  Address @axil's comments
        - [x]  Align dropdowns
        - [x]  No flash when protected branch is updated
    - [x]  Resolve conflicts
    - [x]  Implement protect/unprotect API
    - [x]  Address @dbalexandre's comments
    - [x]  Update EE MR
    - [x]  Address @rymai's comments
        - [x]  Create/Update service should return a `ProtectedBranch`
        - [x]  Successfuly protected branch creation shouldn't `load_protected_branches`
        - [x]  Rename `allowed_to_merge` as #minimum_access_level_for_merge
        - [x]  Rename `allowed_to_push` as #minimum_access_level_for_push
        - [x]  Use `inclusion` and `Gitlab::Access` instead of an `enum`
        - [x]  Modify `check_access` to work with `Gitlab::Access`
        - [x]  Pass `@protected_branch` to `#execute` in `UpdateService`
        - [x]  simplify with a nested field `protected_branch[push_access_level][access_level]`
        - [x]  `developers_can_{merge,push}` should be handled in the API
        - [x]  Use `can?(current_user, ...)` instead of `current_user.can?(...)`
        - [x]  Instantiate `ProtectedBranchesAccessSelect` in `dispatcher.js`
        - [x]  constants regarding downtime migrations
        - [x]  Explicit `#down` for columns with default
    - [x]  Update EE MR
    - [ ]  Wait for CE merge
    - [ ]  Wait for EE merge
    - [ ]  Create issue for UI changes proposed by @zyv


See merge request !5081

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