This changes `needs:` from weak reference
to have a strong reference.

This means that job will not be created
unless all needs are present as part of
a pipeline.

Currently we write out empty CSS classes (`class=""`) every time we
create a new tag. This adds 9 unnecessary bytes per span element. In a
recent trace, I have counted 11950 span elements. So we transported 105
unnecessary kilobytes!

Previously, both InfluxSampler and RubySampler were relying on the
`GC::Profiler.total_time` data which is the sum over the list
of captured GC events. Also, both samplers asynchronously called
`GC::Profiler.clear` which led to incorrect metric data because
each sampler has the wrong assumption it is the only object who calls
`GC::Profiler.clear` and thus could rely on the gathered results between
such calls.

We should ensure that `GC::Profiler.total_time` is called only in one
place making it possible to rely on accumulated data between such wipes.

Also, we need to track the amount of profiler reports we lost.

Changes * to + to be more precise with acceptable branch names

Use NotesFinder to fetch notes on API and Controllers

Closes #52123

See merge request gitlab-org/gitlab-ce!31300

Add exclusive lease to mergeability check process

See merge request gitlab-org/gitlab-ce!31082

This implements the support for `needs:` keyword
as part of GitLab CI. That makes some of the jobs
to be run out of order.

Add additional paths to clean from backtrace

See merge request gitlab-org/gitlab-ce!31363

Fix SystemStackError when Peek bar is active with Rugged calls

Closes #65404

See merge request gitlab-org/gitlab-ce!31357

Remove project from NotesFinder constructor

Add project parameter to specs

Also look for methods in private scope

Fix specs to match new NotesFinder constructor