The method User#projects_limit_left would run "personal_projects.count"
but such a query is not memoized. As a result multiple calls to
User#projects_limit_left would result in multiple COUNT(*) queries being
executed.

To work around this this commit adds User#personal_projects_count which
simply memoizes the result of the COUNT(*) in an instance variable.

The "events" table has a foreign key on "events.project_id" with a
cascading delete. As such it's impossible for an event to have a
non-existing project ID.

In various places we check if the same relation would return projects.
This is done using "any?" which will run a COUNT query with any
LIMIT/OFFSET values still applied.

To work around all this we introduce 2 helper methods that take care of
doing the right thing. This leads to the produced queries being simpler
and fewer queries being executed.

Expose more attributes to unauthenticated GET /projects/:id

See merge request !13283

Synchronous zanata community contribution translation

See merge request !13266

Add Korean translation to i18n

Closes #35852

See merge request !13243

Upgrade haml_lint Gem to 0.26.0

See merge request !13304

Fix Mattermost integration

See merge request !13305

Update the guides for updating GitLab and adding background migrations

See merge request !13284

Gitaly deletions and annotations

See merge request !13280

Merge Request widget Improvements

Closes #33095

See merge request !12601

Fix issues with pdf-js dependencies

See merge request !13328

Fix order of CI lint ace editor loading

Closes #35985

See merge request !13316

Fix Timezone Inconsistencies in User Contribution Calendar

Closes #27616 and #1943

See merge request !13208

Add missing CHANGELOG.md entries for security release on 2017-01-23

See merge request !13327

Fix "Cannot connect to CI server error messages"

Closes #34547

See merge request !13252

Fix "pipeline_schedules pages throwing error 500" when "Active Ci::PipelineSchedule have a nullified `next_run_at`"

Closes #32790

See merge request !13286

Update top bar issues icon

Closes #35275

See merge request !13263

Fix pipeline icon in contextual nav for projects

See merge request !13324

34060 Simply general project settings to use expanded panels

Closes #34060

See merge request !12620

Since mysql is not a priority anymore, test it less

See merge request !13320

Install 'yarn' globally to avoid PATH issues

See merge request !13273

Make dividers of new dropdown style full width

Closes #35784

See merge request !13276

Add container registry and spam logs icons

Closes #35944

See merge request !13317

Add spec to test combining API merge_requests query parameters

See merge request !11172

CE: Move EE-specific files to a standalone directory

Closes gitlab-ee#3097

See merge request !13311

Revert "Merge branch 'rs-warm-capybara-only-in-ci' into 'master'"

See merge request !13292

Migrate Repository#last_commit_for_path to Gitaly

Closes gitaly#433

See merge request !13200

Migrate blame loading to Gitaly

Closes gitaly#421

See merge request !13155

Closes #35985