Merge #7303

7303: Refactor ruby core integration r=hsbt a=deivid-rodriguez

### What was the end-user problem that led to this PR?

The problem was that sometimes we break specs when integrating bundler changes into core.

### What was your diagnosis of the problem?

My diagnosis was that sometimes we use paths dependent on the structure of this repo, but that break under ruby-core's structure.

### What is your fix for the problem, implemented in this PR?

My fix is only some refactoring so that usage of structure independent helpers is encouraged. After this set of changes, if you grep the repo for `ruby_core?`, the only result will be `spec/support/path.rb`. That means that all logic dealing with repo folder structure lives in a single place. 

### Why did you choose this fix out of the possible options?

I chose this fix because it makes the integration in core cleaner.


Co-authored-by: David Rodríguez <deivid.rodriguez@riseup.net>

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