Speedup the `ee_compat_check` job

Closes #38605

See merge request gitlab-org/gitlab-ce!15324

Fix image diff notes email

Closes #39238

See merge request gitlab-org/gitlab-ce!15299

Add Gitlab::Utils::StrongMemoize

Allows patterns like this:

    def trigger_from_token
      return @Trigger if defined?(@Trigger)

      @Trigger = Ci::Trigger.find_by_token(params[:token].to_s)
    end

Closes #39842

See merge request gitlab-org/gitlab-ce!15222

Fix users autocomplete in a subgroup

Closes #39452

See merge request gitlab-org/gitlab-ce!15350

fix to allow integer label refernces

See merge request gitlab-org/gitlab-ce!14607

We should include users who have access from parent groups, not just direct
members of the current group.

Move update_project_counter_caches? out of issue and merge request

Closes #39602

See merge request gitlab-org/gitlab-ce!15300

Prevent error when authorizing an admin-created OAauth application without a set owner

Closes #40086

See merge request gitlab-org/gitlab-ce!15349

Add total time spent to milestones

Closes #39335

See merge request gitlab-org/gitlab-ce!15116

Added tests to multi-file Vuex store

See merge request gitlab-org/gitlab-ce!15147

Repository Exists check is OPT_OUT for Gitaly

See merge request gitlab-org/gitlab-ce!15287

Update Services API documentation for Kubernetes service

See merge request gitlab-org/gitlab-ce!15343

Export text utils as ES6 modules

Closes #40018 and #37851

See merge request gitlab-org/gitlab-ce!15320

Fix permissions link for project member docs

Closes #40038

See merge request gitlab-org/gitlab-ce!15325

Clear filter on gl_dropdown open

Closes #39564

See merge request gitlab-org/gitlab-ce!15214

Fix QA page refresh address by using absolute URLs

Closes gitlab-qa#99

See merge request gitlab-org/gitlab-ce!15338

This makes QA page refresh address to be absolute URL since we dropped
`Capybara.app_host`, thus there is no support for relative URLs with
`visit` now.

[ci skip]

Revert "Merge branch 'add-typescript' into 'master'"

See merge request gitlab-org/gitlab-ce!15327

This reverts merge request !15264

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

Add Update guide for 10.2

See merge request gitlab-org/gitlab-ce!15316