Avoid filling target branch when unknown and source is default branch

Closes #62807

See merge request gitlab-org/gitlab-ce!32701

Merge branch 'reprazent/gitlab-ce-bvl-find-correct-variables-for-testing-translations' into 'master'

Build correct variables for testing translations

Closes #48110

See merge request gitlab-org/gitlab-ce!32871

Start of fix for #21859, allow users to open files with newlines in the filenames.

Closes #21859

See merge request gitlab-org/gitlab-ce!32820

Eagerly load Issue-Epic-association

Closes #14738

See merge request gitlab-org/gitlab-ee!15886

Simplify specs for Project#disabled_services

See merge request gitlab-org/gitlab-ee!16326

Add index on group_id column concurrently

See merge request gitlab-org/gitlab-ce!32826

This fixes previously added migration which caused timeouts on
big events table.

This makes sure we build the correct variables for testing
translations.

When translating, we could be specifying the variables in different
forms for each id:

- In the singular we could be using a `%{hash}` interpolation
- In the plural we could be using a `%d` interpolation

This changes the tests to accommodate for that: We now use the
variables used in the relevant translation id as the source for the
variables we mix in in specs.

In case the source and the target project are the same, the
source branch is the default branch, and the target branch
is not present, we will avoid prefilling the target branch
with the repository default branch. Letting the user decide.

Add EE label to repository_storage

See merge request gitlab-org/gitlab-ce!31933

Start linting for unneeded dollar signs

See merge request gitlab-org/gitlab-ce!32803

Do not use dollar signs in shell codeblocks when
no output is shown

[CE] Add event presenter

See merge request gitlab-org/gitlab-ce!32750

This presenter will be used in an upcoming MR which adds
rendering of epic events on group activity page.

[EE] Add event presenter

See merge request gitlab-org/gitlab-ee!16225

This presenter will be used in an upcoming MR which adds
rendering of epic events on group activity page.

Move SAST reports logic for the Merge Request widget to the backend - frontend part

Closes #13647

See merge request gitlab-org/gitlab-ee!15804

- Copies over all the changes from the similar MRs for DAST, dependency
  and container scanning.
- Everything is behind an inactive feature flag.

See https://gitlab.com/gitlab-org/gitlab-ee/issues/12002 for more
information.

Refactor the Dependency Scanning docs

See merge request gitlab-org/gitlab-ce!32582

Notably:

- Merge the use cases with the opening paragraph of DS
- Add link to the auto-remediation section in the main index page
- Add auto remediation to the title of solutions for better SEO
- Move the JSON reports section below the other more important sections
- Remove Container Scanning from the list of supported scanners in
  solutions
- Fix some "introduced in" sentences so that they can be properly parsed

Fix broken link to the handbook

See merge request gitlab-org/gitlab-ce!32849

Only CODEOWNERS on default branch affect MR approvals

See merge request gitlab-org/gitlab-ce!32841

Add user creation documentation

Closes gitlab-com/support/support-team-meta#1681

See merge request gitlab-org/gitlab-ce!32411

Avoid calling freeze on already frozen strings in lib

See merge request gitlab-org/gitlab-ce!32788