Show Ajax requests in performance bar

Closes #43925

See merge request gitlab-org/gitlab-ce!17742

[Rails5] Update active_record_locking initializer

See merge request gitlab-org/gitlab-ce!17824

Optional '/-/' delimiter for search API

See merge request gitlab-org/gitlab-ce!17750

Improvements for prometheus metrics documentation

See merge request gitlab-org/gitlab-ce!17838

Ignore unsubscribed toggle for @ mentions

Closes #43933

See merge request gitlab-org/gitlab-ce!17786

Clean up selectors in framework/header.scss

Closes #44383

See merge request gitlab-org/gitlab-ce!17822

But first, rewrite the performance bar in Vue:

1. Remove the peek-host gem and replace it with existing code. This also allows
   us to include the host in the JSON response, rather than in the page HTML.
2. Leave the line profiler parts as here-be-dragons: nicer would be a separate
   endpoint for these, so we could use them on Ajax requests too.
3. The performance bar is too fiddly to rewrite right now, so apply the same
   logic to that.

Then, add features! All requests made through Axios are able to be tracked. To
keep a lid on memory usage, only the first two requests for a given URL are
tracked, though. Each request that's tracked has the same data as the initial
page load, with the exception of the performance bar and the line profiler, as
explained above.

'/-/' delimiter is used only in UI, in API we don't use it for
other endpoints. To align search endpoints with the rest of API
endpoints, this patch makes '/-/' optional for existing endpoints (to
keep backward compatibility).

Documentation is updated to prefer paths without '/-/'.

Resolve "Add documentation for "Display ingress IP address in the Kubernetes page""

Closes #44330, #42761, and #43526

See merge request gitlab-org/gitlab-ce!17836

Update google-api-client 0.13.6 -. 0.19.8

See merge request gitlab-org/gitlab-ce!17790

Unify format for nested non-task lists

Closes #44384

See merge request gitlab-org/gitlab-ce!17823

Remove N+1 queries in /admin/projects page

See merge request gitlab-org/gitlab-ce!17834

Move ShaMismatch vue component

See merge request gitlab-org/gitlab-ce!17546

Fix "Can't modify frozen hash" error when project is destroyed

See merge request gitlab-org/gitlab-ce!17816

Update doorkeeper-openid_connect and doorkeeper

See merge request gitlab-org/gitlab-ce!17797

Remove oj as we're not using it

See merge request gitlab-org/gitlab-ce!17863

Merge branch '43928-merge-request-comment-gets-cleared-once-the-previous-comment-is-submitted' into 'master'

Resolve "Notes karma specs failing"

Closes #44002

See merge request gitlab-org/gitlab-ce!17627

Relax omniauth-saml 1.0.0 -> 1.10

Closes #14292

See merge request gitlab-org/gitlab-ce!17764

Atomic generation of internal ids for issues.

Closes #31114

See merge request gitlab-org/gitlab-ce!17580

Added Video explaining Cloud native GitLab Chart

See merge request gitlab-org/gitlab-ce!17844

Merge branch '44257-viewing-a-particular-commit-gives-500-error-error-undefined-method-binary' into 'master'

Resolve "Viewing a particular commit gives 500 error ~ Error (undefined method `binary?')"

Closes #44257

See merge request gitlab-org/gitlab-ce!17805

Resolve "GitLab Community Edition 10.5.3 shows plural for 1 item"

Closes #44022

See merge request gitlab-org/gitlab-ce!17697

Updates svg dependency

See merge request gitlab-org/gitlab-ce!17843

Make issue boards height calculation clearer and remove magic numbers

See merge request gitlab-org/gitlab-ce!17791

Rename `package-qa` in docs

See merge request gitlab-org/gitlab-ce!17842

In gitlab-org/gitlab-ce!17807 the `package-qa` job was renamed to
`package-and-qa`. But it was not renamed in the docs. So this change
fixes that.

Update CI services documnetation

Closes gitlab-runner#3095

See merge request gitlab-org/gitlab-ce!17749