* master: (112 commits)
  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
  Improve down step of removing issues.assignee_id column
  Fix specs after removing assignee_id field
  Remove issues.assignee_id column
  Resolve conflicts in app/models/user.rb
  Fix image view mode
  Do not raise when downstream pipeline is created
  Remove the need for destroy and add a comment in the spec
  Use build instead of create in importer spec
  Simplify normalizing of paths
  Remove allocation tracking code from InfluxDB sampler for performance
  ...

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

The endpoint was returning 404 because it was only searching on the
current members of a Group or Project and not the access requesters.

This migration also needs to be a post-deployment migration, as it removes a
column.

Remove a header level in the new 'Automatic CE->EE merge' doc

See merge request gitlab-org/gitlab-ce!15843

Keep track of the circuit breaker access check timings

Closes #39698

See merge request gitlab-org/gitlab-ce!15612

Do not raise when downstream pipeline is created

Closes #40987

See merge request gitlab-org/gitlab-ce!15837

Pick 10.2.4 security fixes into master

See merge request gitlab-org/gitlab-ce!15821

# Conflicts:
#   app/assets/javascripts/issue_show/components/app.vue

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

Add recaptcha_check_if_spammable for issualbes than arent spammables

See merge request gitlab-org/gitlab-ce!15817

Using update_column_in_batches means that we can chunk the updates.

Todo count calculations now expired quicker for top bar stats

See merge request gitlab-org/gitlab-ce!15794

Turn" push a file" into a scenario

See merge request gitlab-org/gitlab-ce!15617

Fix image view mode

Closes #40945

See merge request gitlab-org/gitlab-ce!15803

Convert Compare and CompareAutocomplete classes into ES module syntax

See merge request gitlab-org/gitlab-ce!14857

Fix gitlab:import:repos Rake task moving repositories into the wrong location

Closes #40765

See merge request gitlab-org/gitlab-ce!15823