* upstream/master: (467 commits)
  Update docs board features tier
  Upgrade grape-path-helpers to 1.0.6
  Remove healthchecks from prometheus endpoint
  Fix find_branch call sites
  Ensure Encoding.default_external is set to UTF-8 when running QA scenarios
  i18n: externalize strings from 'app/views/admin/groups'
  Backport mr widget changes from EE
  Allow to toggle notifications for issues due soon
  Vuex test helper improvements
  whitespace
  Make more ref RPC's mandatory
  Resolve "Improve performance of MR Changes tab: reduce event listeners on scroll event"
  Remove old service architecture from Vue docs
  Adding spec to test basic forking functionalities
  Fix performance problem of accessing tag list for projects api endpoints
  typo
  Add sleep to QA test before installing tiller
  Include Vue files that are not covered by tests in test coverage
  Remove Repository#path memoization
  Resolve "do not set updated_at when creating note"
  ...

Open pipeline list panel when clicking CI icon in Web IDE

Closes #47843

See merge request gitlab-org/gitlab-ce!20516

Update docs board features tier

See merge request gitlab-org/gitlab-ce!20602

Make more ref RPC's mandatory

Closes gitaly#526, gitaly#965, gitaly#476, and gitaly#474

See merge request gitlab-org/gitlab-ce!20592

Upgrade grape-path-helpers to 1.0.6

See merge request gitlab-org/gitlab-ce!20601

Polish severity level facets further

See merge request gitlab-org/gitlab-ce!20572

Include Vue files without tests in coverage report

Closes #48912

See merge request gitlab-org/gitlab-ce!20431

Remove healthchecks from prometheus endpoint

Closes #49112

See merge request gitlab-org/gitlab-ce!20565

Backport mr widget changes from EE

See merge request gitlab-org/gitlab-ce!20598

i18n: externalize strings from 'app/views/admin/groups'

See merge request gitlab-org/gitlab-ce!19924

Resolve "QA: False failure on QA test "Push to protected branch when allowed" during staging failover rehearsal"

Closes #48241

See merge request gitlab-org/gitlab-ce!20561

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

Allow to toggle notifications for issues due soon

Closes #47709

See merge request gitlab-org/gitlab-ce!20530

Signed-off-by: Tao Wang <twang2218@gmail.com>

Vuex test helper improvements

Closes #44912, #44919, and #44920

See merge request gitlab-org/gitlab-ce!20513

[QA] Fix duplicate year in namespace name

See merge request gitlab-org/gitlab-ce!20581

Resolve "Installing helm tiller sometimes fails with no api token found"

Closes #49139

See merge request gitlab-org/gitlab-ce!20580

Fix performance problem of tags query

Closes gitlab-com/infrastructure#4550

See merge request gitlab-org/gitlab-ce!20555

Update CONTRIBUTING.md to port Contribution Flow section from EE doc

See merge request gitlab-org/gitlab-ce!20546

Resolve "Improve performance of MR Changes tab: reduce event listeners on scroll event"

Closes #48639 and #48789

See merge request gitlab-org/gitlab-ce!20558

Remove old service architecture from Vue docs

See merge request gitlab-org/gitlab-ce!20579

Adding spec to test basic forking functionalities

See merge request gitlab-org/gitlab-ce!20097

Resolve "Follow-up from "Milestone tests""

Closes #48690

See merge request gitlab-org/gitlab-ce!20563

Add manifest import

See merge request gitlab-org/gitlab-ce!20304

Add examples for array and hash type API params

See merge request gitlab-org/gitlab-ce!20574

Optimize ProjectWiki#empty? check

See merge request gitlab-org/gitlab-ce!20573