Update GitLab Workhorse to v5.1.0

See merge request gitlab-org/gitlab-ce!20900

Bump prometheus-client-mmap to 0.9.4

See merge request gitlab-org/gitlab-ce!20891

Resolve "Mutual SSL Auth For Helm TIller"

Closes #48098

See merge request gitlab-org/gitlab-ce!20801

Resolve "Sorting by name on milestones page renders a 500 error"

Closes #49701

See merge request gitlab-org/gitlab-ce!20881

We should sort by title because name is only an alias for
the title attribute on the milestone model.

[Backport] View summed weights of issues in board column

See merge request gitlab-org/gitlab-ce!20860

Resolve "Copy diff file path as GFM" is broken

Closes #48823

See merge request gitlab-org/gitlab-ce!20725

Backport of EE-1499

See merge request gitlab-org/gitlab-ce!20879

Require has_internal_id to pass a init block.

Closes #49609

See merge request gitlab-org/gitlab-ce!20873

This was not happening very often but with the previous changes to
create SSL certs for helm tiller it takes long enough to be created that
we see the test failing a lot more

Extend gitlab-ci.yml to request junit.xml test reports

See merge request gitlab-org/gitlab-ce!20390

Remove references to FS Shard check from the docs

Closes #49725

See merge request gitlab-org/gitlab-ce!20897

Add support for searching users by confirmed e-mails

See merge request gitlab-org/gitlab-ce!20893

This is useful since the current scheme allows us to freely delete any
records in internal_ids. If the record is not there, it will get rebuild
using the init block.

We require passing in 'init for the time being and as long as its
not expensive to do so. This makes the scheme a bit more robust.

If at some point, this is expensive - we may choose to make this
optional while losing the ability to recalculate the value on the fly.

Closes #49609.

Resolve "Merge Request API response is missing changes_count"

Closes #47728

See merge request gitlab-org/gitlab-ce!19745

These checks were a no op on Cloud native environments, and the checks
were migrated as part of:
https://gitlab.com/gitlab-org/gitaly/merge_requests/767

Closes https://gitlab.com/gitlab-org/gitlab-ce/issues/49725

This is in preparation for modifying importers to assign e-mails for
only confirmed emails.

Fixes failing builds with gcc on Archlinux and Ruby 2.4.4.

See https://gitlab.com/gitlab-org/prometheus-client-mmap/merge_requests/26
for more details.

This is refactoring in the lead up to passing mutual TLS certs for helm applications. As such we expect all applications to need config files so we can remove the logic about which applications need and do not need this (ie `#config_map?`).