Moving more git operations to be executed by Gitaly, now the check if a
repository exists is an opt out endpoint.

Can be disabled, for the time being, by performing in the rails console:
> Feature.get('gitaly_repository_exists').disable
=> true

Part of gitlab-org/gitaly#314

Include X-Content-Type-Options (XCTO) header into API responses

See merge request gitlab/gitlabhq!2211

(cherry picked from commit 6c818e77f2abeef2dd7b17a269611b018701fa79)

e087e075 Include X-Content-Type-Options (XCTO) header into API responses

Replace SSRF resolver with Addrinfo.getaddrinfo to include alternative localhost versions

See merge request gitlab/gitlabhq!2219

(cherry picked from commit 4a1e73783d5480aa514db7b53e10c075f95580b5)

1bffa0c3 Replace SSRF resolver with Addrinfo.getaddrinfo to include alternative localhost versions

Fail when issuable_meta_data is called on an unlimited collection

Closes #39845

See merge request gitlab-org/gitlab-ce!15249

Github enterprise support importer

Closes #39931

See merge request gitlab-org/gitlab-ce!15281

Fix issue 39935 : Add created_at and updated_at fields in MR payload

Closes #39935

See merge request gitlab-org/gitlab-ce!15274

This task was broken in a few areas with the removal of the old GitHub
importer code.

Migrate GitLab::Git::Wiki.update_page to Gitaly

Closes gitaly#700

See merge request gitlab-org/gitlab-ce!15268

This was removed by accident as the old GitHub importer handled this
deep down the codebase, making it easy to miss.

Remove ineffective Vue service specs

See merge request gitlab-org/gitlab-ce!15277

Fix Error 500 when pushing LFS objects with a write deploy key

Closes #39467

See merge request gitlab-org/gitlab-ce!15039

Added file storage documentation and updated hash storage one

See merge request gitlab-org/gitlab-ce!15269

Use Commit#notes and Note.for_commit_id when possible to make sure we use all indexes available to us

Closes #34509

See merge request gitlab-org/gitlab-ce!15253

Make a note of which files to check in after externalizing strings

See merge request gitlab-org/gitlab-ce!15207

Resolve "Merge request widget - CI information has different margins"

Closes #38395

See merge request gitlab-org/gitlab-ce!15237

Fix test selection in Test::Integration::Mattermost

See merge request gitlab-org/gitlab-ce!15278

In ce3b81b9 we changed Test::Integration::Mattermost#perform to
consume a required positional parameter and pass on the rest of the
arguments to the superclass. There was an error in implementation here
and instead of splatting the files array to produce no additional
arguments, we passed in the default case an empty array.

This had the effect of calling rspec with no test files,
rather than expected default of 'qa/specs/features`

Here we correct that bug, and re-add the :core suite, as that was a poor
deuction in the investagtion for 74d6b8a2.

Rewrite the GitHub importer to perform work in parallel and greatly improve performance

Closes #33135, #38621, and #39361

See merge request gitlab-org/gitlab-ce!14731

Added missing strings to prepare the tags page for internationalization

See merge request gitlab-org/gitlab-ce!15256

Use Commit#notes and Note.for_commit_id when possible to make sure we use all the indexes available to us

Add Internal QA specs to the pipeline

See merge request gitlab-org/gitlab-ce!15240

Change Sign Out route from a DELETE to a GET

Closes #39708

See merge request gitlab-org/gitlab-ce!15231

Add those fields to the documentation payload about merge requests that were missing but actually present when calling the endpoints

Cleanup tests

See merge request gitlab-org/gitlab-ce!15261

When deleting merged branches, ignore protected tags

Closes #39732

See merge request gitlab-org/gitlab-ce!15252

Free some reserved group routes

See merge request gitlab-org/gitlab-ce!15052

Make BackgroundTransaction#labels public

See merge request gitlab-org/gitlab-ce!15257

fix karma config file

See merge request gitlab-org/gitlab-ce!15263

Modals in UX guide

See merge request gitlab-org/gitlab-ce!14886

Adds typescript support in webpack. With Mike G.

See merge request gitlab-org/gitlab-ce!15264