Merge Templates updates

See merge request gitlab-org/gitlab-ce!20585

Close revert and cherry pick modal on escape keypress

See merge request gitlab-org/gitlab-ce!20341

Document pattern for .find_or_create and siblings

See merge request gitlab-org/gitlab-ce!20649

Add small improvement to Manifest import feature docs

See merge request gitlab-org/gitlab-ce!20637

Move Danger to test stage

Closes #49185

See merge request gitlab-org/gitlab-ce!20654

Add cross-link to N+1 issue

See merge request gitlab-org/gitlab-ce!20663

Implement customized sidebar

Closes #14995

See merge request gitlab-org/gitlab-ce!17940

[ci-skip]

Migrate merge base, merged branches, write ref

Closes gitaly#748, gitaly#695, and gitaly#799

See merge request gitlab-org/gitlab-ce!20639

Add emails delivery metrics

Closes #49214

See merge request gitlab-org/gitlab-ce!20638

Resolve "Change API docs to reflect that lookup by username does not require admin access"

Closes #38095

See merge request gitlab-org/gitlab-ce!20646

Update pipelines.md to have correct curl commands

See merge request gitlab-org/gitlab-ce!20653

Signed-off-by: Rémy Coutable <remy@rymai.me>

Signed-off-by: Rémy Coutable <remy@rymai.me>

Signed-off-by: Rémy Coutable <remy@rymai.me>

Fix archived parameter for projects API

Closes #32301

See merge request gitlab-org/gitlab-ce!20566

Fix typo in CSS transform property for Memory Graph component

Closes #49291

See merge request gitlab-org/gitlab-ce!20650

Resolve "NoMethodError: undefined method `namespace' for nil:NilClass"

Closes #49061

See merge request gitlab-org/gitlab-ce!20615

Enable frozen string in apps/services/*.rb

See merge request gitlab-org/gitlab-ce!20401

* upstream/master: (53 commits)
  Fix invalid link to GitLab.com architecture.md
  i18n: externalize strings from 'app/views/import'
  Remove Repository#lookup and unreachable rugged code
  refactor code based on feedback
  Trigger rails5 tests either by variable or ref name
  Fix link in help doc which was linking to old mono-repo, now in its own repo
  Allow Danger step to fail
  update webpack to v4.16
  Backport logger changes from EE
  Add the CI Job trigger as the build trigger
  Remove flaky and redundant expectations
  use fileuploader dynamic path method in uploads manager and add spec
  fix typo in uploads manager
  add small comment to download method in uploads manager
  refactor uploads manager
  Update 10.6-to-10.7.md
  Lazy-load performance bar UI
  Update .gitlab-ci.yml
  fixed test to correctly text relative URLs doesnt add query param if source & target projects match
  Add changelog entry
  ...

Update issue closing pattern

Closes #49166

See merge request gitlab-org/gitlab-ce!20554

Update Git version to 2.18.0

See merge request gitlab-org/gitlab-ce!20489

Fix invalid link to GitLab.com architecture.md

See merge request gitlab-org/gitlab-ce!20645

Add a 10 ms bucket for SQL timings

See merge request gitlab-org/gitlab-ce!20527

i18n: externalize strings from 'app/views/import'

See merge request gitlab-org/gitlab-ce!19732

Partially addresses #47424.

Move "search by email or username" block to "for normal users" section