* master: (54 commits)
  Updated image for diff navigation docs
  Milestone sidebar docs
  Use app host instead of asset host when rendering image blob or diff
  ActiveRecord::StaleObjectError: Attempted to update a stale object: Ci::Build
  Use shared interceptor in note specs
  Ignore temporary table in schema
  Check for null in job tooltip title
  Clarify casing of I18N placeholder names
  fixes some markup issues in the js style guide docs
  Fix migration that removes issues.branch_name
  small change to make less conflict with EE version
  Add cop for use of remove_column
  Resolve merge conflicts with dev.gitlab.org/master after security release
  add index for doc/administration/operations/
  Remove RubySampler#sample_objects for performance as well
  Bugfix: User can't change the access level of an access requester
  Add spec for removing issues.assignee_id
  updated imports
  Keep track of storage check timings
  Remove a header level in the new 'Automatic CE->EE merge' doc
  ...

Add js prefix for issuable-edit

Closes #40965

See merge request gitlab-org/gitlab-ce!15813

Stop "ERROR: TypeError{}" from being logged to the console and fail tests

Closes #37619

See merge request gitlab-org/gitlab-ce!15830

Updated image for diff navigation docs

See merge request gitlab-org/gitlab-ce!15875

Use app host instead of asset host when rendering image blob or diff

Closes #41002

See merge request gitlab-org/gitlab-ce!15854

Merge branch '41023-activerecord-staleobjecterror--attempted-to-update-a-stale-object--ci-build' into 'master'

Job dropping by MissingDependenciesError should consider StaleObjectError

Closes #41023

See merge request gitlab-org/gitlab-ce!15873

Checks for null in job tooltip title

Closes #40997

See merge request gitlab-org/gitlab-ce!15869

Milestone sidebar docs

See merge request gitlab-org/gitlab-ce!15861

Fix migration that removes issues.branch_name

See merge request gitlab-org/gitlab-ce!15858

Clarify casing of I18N placeholder names

See merge request gitlab-org/gitlab-ce!15867

Fix comment on image discussion icon alignment (update icons)

Closes #39608

See merge request gitlab-org/gitlab-ce!15760

rename remaining issue_ prefixed files

See merge request gitlab-org/gitlab-ce!15818

Ignore temporary table in schema

Closes #40976

See merge request gitlab-org/gitlab-ce!15866

Gitaly mirroring migration prep

Closes gitaly#816

See merge request gitlab-org/gitlab-ce!15775

Backport epic in issue

See merge request gitlab-org/gitlab-ce!15799

fixes some markup issues in the js style guide docs

See merge request gitlab-org/gitlab-ce!15828

Moved URL utility methods into exported es modules

See merge request gitlab-org/gitlab-ce!15783

Animate contextual sidebar; change class names for easier readability

Closes #35724

See merge request gitlab-org/gitlab-ce!15797

Docs: add index for `doc/administration/operations/`

See merge request gitlab-org/gitlab-ce!15852

Add cop for use of remove_column

See merge request gitlab-org/gitlab-ce!15855

small change to make less conflict with EE version

See merge request gitlab-org/gitlab-ce!15809

remove_column should only be used in the up (or change) step of a migration if
it's a post-deployment migration. Otherwise there will be downtime due to the
ActiveRecord column cache, which we can avoid by using the IgnorableColumn
concern in combination with a post-deployment migration.

Resolve merge conflicts with dev.gitlab.org/master after security release

See merge request gitlab-org/gitlab-ce!15851

Remove allocation tracking code from InfluxDB sampler for performance

Closes gitlab-com/infrastructure#3250

See merge request gitlab-org/gitlab-ce!15834

Remove issues.assignee_id column

Closes #30453

See merge request gitlab-org/gitlab-ce!11637

Bugfix: User can't change the access level of an access requester

Closes #40743

See merge request gitlab-org/gitlab-ce!15832

Properly bump prometheus-client-mmap gem versions

See merge request gitlab-org/gitlab-ce!15825