Show a reCAPTCHA on signin page if custom header is set

Closes #48184

See merge request gitlab-org/gitlab-ce!20076

This will only be displayed if `X-GitLab-Show-Login-Captcha` is set as an HTTP
header.

Retroactively add changelogs

See merge request gitlab-org/gitlab-ce!20079

Enable webpack nodeEnv optimization

See merge request gitlab-org/gitlab-ce!20075

For community contributions, changelogs
should be added to the MR.

Fix diff comment alignment for parallel code additions

Closes #47861

See merge request gitlab-org/gitlab-ce!20006

Move boards modal EmptyState vue component

See merge request gitlab-org/gitlab-ce!20068

Fix multiple active tabs when Crowd or LDAP is in use

Closes #48192

See merge request gitlab-org/gitlab-ce!20049

Unify spec/support/shared_examples/features/project_features_apply_to_issuables_shared_examples.rb

See merge request gitlab-org/gitlab-ce!20073

Allow omnibus to disable sourcemaps in memory constrained environments

See merge request gitlab-org/gitlab-ce!20053

Add `gitlab` chart documentation

See merge request gitlab-org/gitlab-ce!20056

CE: Resolve "Extract EE specific files/lines for project_creator_spec"

See merge request gitlab-org/gitlab-ce!19850

Follow-up to !19808: Split up for-loop initializations

See merge request gitlab-org/gitlab-ce!19915

Restore custom hooks for wiki

See merge request gitlab-org/gitlab-ce!20065

Changes tab VUE refactoring

Closes #42882

See merge request gitlab-org/gitlab-ce!17011

[Rails5] Set request.format in commits_controller

Closes #48144 et #48143

See merge request gitlab-org/gitlab-ce!20023

Add enabled prefix to feature keys to be consistent with other keys

See merge request gitlab-org/gitlab-ce!20043

Properly detect label reference if followed by period or question mark

See merge request gitlab-org/gitlab-ce!19965

[Rails5] Fix ActionCable's mount_path configuration

See merge request gitlab-org/gitlab-ce!20051

Rails 5 fix Capybara::ElementNotFound: Unable to find visible css #modal-revert-commit

Closes #48140 et #48139

See merge request gitlab-org/gitlab-ce!20044

Raw changes calculation is Gitaly only now

Closes gitaly#1138

See merge request gitlab-org/gitlab-ce!20057

We need this because `expect_any_instance_of` doesn't work on
prepended models. Now we could use the same code between CE/EE

Add a cop for `FinderMethods`

Closes #42705

See merge request gitlab-org/gitlab-ce!19951

Closes https://gitlab.com/gitlab-org/gitaly/issues/1138

[ci skip]

Fix a couple Vuex typos

See merge request gitlab-org/gitlab-ce!20046

Docs: update style guidelines with rules for navigation items

See merge request gitlab-org/gitlab-ce!20024

Fix N+1 queries in uploads check rake task

Closes #47924

See merge request gitlab-org/gitlab-ce!20012