Simplify CI/CD configuration on serverless projects

Closes #57405

See merge request gitlab-org/gitlab-ce!25523

Link to the MR from current branch in Web IDE

Closes #49663

See merge request gitlab-org/gitlab-ce!25689

Resolve "CI status icon mismatch on Merge Requests page and the MR itself"

Closes #45305

See merge request gitlab-org/gitlab-ce!25407

Script to generate Perf Testdata

Closes #58140

See merge request gitlab-org/gitlab-ce!25548

Scope gitlab:ui:visual pipeline job to css only changes

Closes #58514

See merge request gitlab-org/gitlab-ce!25755

Rename ambiguous association names in Ci::Pipeline

See merge request gitlab-org/gitlab-ce!25672

Add gitlab ui visual test

See merge request gitlab-org/gitlab-ce!24255

Update Health Check typo & adjust formatting

See merge request gitlab-org/gitlab-ce!25722

docs: ldap users must have email address set

Closes #40071

See merge request gitlab-org/gitlab-ce!25691

fix it ok

Fix

head pipeline

Expose additional merge request pipeline variables

See merge request gitlab-org/gitlab-ce!24595

Conflicts:
  doc/ci/variables/README.md
  spec/models/ci/pipeline_spec.rb

commit page info-well overflow fix #56436

Closes #56436

See merge request gitlab-org/gitlab-ce!24799

sidekiq: terminate child processes at shutdown

See merge request gitlab-org/gitlab-ce!25669

Quarantine git protocol v2 tests

See merge request gitlab-org/gitlab-ce!25744

 New `Api.projectMergeRequests` allows:
 - to query for all MRs on a project without specifying `mergeRequestId`
 - to filter the returned MRs using parameters from
 https://bit.ly/2H7We4V

 The new API request is used for fetching information about MRs
 associated with a particular branch in Web IDE to have IdeSidebar
 behave consistently in both scenarios:
 - getting to a branch from and MR (where we already have info about
 relevant MR), or
 - getting to a branch somehow differently directly

For cases where there are several merge requests that the current branch
is associated with, mark the most recent one as 'current'

Closes https://gitlab.com/gitlab-org/gitlab-ce/issues/49663

Removes EE differences from ci_icon.vue

Closes gitlab-ee#10084

See merge request gitlab-org/gitlab-ce!25742

Sidekiq jobs frequently spawn long-lived child processes to do work.
In some circumstances, these can be reparented to init when sidekiq is
terminated, leading to duplication of work and strange concurrency
problems.

This commit changes sidekiq so that, if run as a process group leader,
it will forward `INT` and `TERM` signals to the whole process group. If
the memory killer is active, it will also use the process group when
resorting to `kill -9` to shut down.

These changes mean that a naive `kill <pid-of-sidekiq>` will now do the
right thing, killing any child processes spawned by sidekiq, as long as
the process supervisor placed it in its own process group.

If sidekiq isn't a process group leader, this new code is skipped.

De-quarantine project activity test

Closes gitlab-org/quality/staging#21

See merge request gitlab-org/gitlab-ce!25630

Adjusted a few different areas per Evan R's suggestions within the open
MR for this branch.

This commits add a job that is going to be triggered whenever someone
adds `[serverless deploy-functions]` text into their commit message.

This make it really simple to deploy functions in FaaS-only project.