* master: (53 commits)
  Updated timeago.js
  Prevent 500 error when inspecting job after trigger was removed
  Add classList polyfill for IE classList.toggle(.., force)
  Use feature flag instead of application settigns to control if method calls should be instrumented
  Rename wip to worker_id
  add missing schema entry and application settigns helper
  Use only real duration to measure method call performance via Prometheus
  check method timing threshold when observing method performance
  Add changelog for #15558
  Reenable prometheus metrics
  Move prometheus middle ware to prometheus initialized.
  Fix WIP system note not being created
  Update CHANGELOG.md for 10.2.2
  Fix hashed storage for attachments bugs
  Rename fetch_refs to refmap
  Clean up repository fetch and mirror methods
  Fix pulling and pushing using a personal access token with the sudo scope
  Allow password authentication to be disabled entirely
  Simplify the DB changes checklist
  Added Rubocop config for background migrations
  ...

Resolve "Update timeago.js"

Closes #40465

See merge request gitlab-org/gitlab-ce!15553

Fix WIP system note not being created

Closes #40374

See merge request gitlab-org/gitlab-ce!15528

Prevent 500 error when inspecting job after trigger was removed

Closes #36400

See merge request gitlab-org/gitlab-ce!15447

Add classList polyfill for IE classList.toggle('foo', force)

Closes #38916

See merge request gitlab-org/gitlab-ce!15552

Fix pulling and pushing using a personal access token with the sudo scope

Closes #40466

See merge request gitlab-org/gitlab-ce!15571

Update Prometheus Gem version and disable Prometheus method call instrumentation by default.

Closes gitlab-ee#4139 and #40457

See merge request gitlab-org/gitlab-ce!15558

Fix https://gitlab.com/gitlab-org/gitlab-ce/issues/38916

[ci skip]

Fix hashed storage for attachments bugs

Closes #40280

See merge request gitlab-org/gitlab-ce!15482

Clean up repository fetch and mirror methods

See merge request gitlab-org/gitlab-ce!15424

Fixed import of render mermaid & render math methods

See merge request gitlab-org/gitlab-ce!15550

Renamed ProtectedBranches::ApiUpdateService to LegacyApiUpdateService

See merge request gitlab-org/gitlab-ce!15575

Simplify the DB changes checklist

See merge request gitlab-org/gitlab-ce!15577

Move identical merged branch check to merged_branch_names

Closes #39887

See merge request gitlab-org/gitlab-ce!15464

Added Rubocop config for background migrations

See merge request gitlab-org/gitlab-ce!15576

Use foreign key to get latest MR diff

Closes #37631

See merge request gitlab-org/gitlab-ce!15126

Fix link text from group context

Closes gitlab-ee#4100

See merge request gitlab-org/gitlab-ce!15565

Allow password authentication to be disabled entirely

Closes #37320

See merge request gitlab-org/gitlab-ce!15223

This removes some somewhat redundant checkboxes from the template and
rephrases the introduction now that those settings are in GDK.

[ci skip]

This adds a Rubocop configuration file specific to
lib/gitlab/background_migrations. This configuration will be used to
(hopefully) make reviewing background migrations easier by enforcing
stricter rules compared to the rest of GitLab. Because this
configuration is directory specific it will only affect background
migrations.

Remove cluster_id from 20171013104327_migrate_gcp_clusters_to_new_clusters_architectures

See merge request gitlab-org/gitlab-ce!15566