Combine frontend style guides - docs

Closes gitlab-org/frontend/general#25

See merge request gitlab-org/gitlab!20969

This is part of a wider effort to consolidate
frontend development guides. Issue here:
https://gitlab.com/gitlab-org/frontend/general/issues/25

Keyset pagination for `Project` based on `id` column

See merge request gitlab-org/gitlab!19623

Fix check for existing ES limited indexing IDs

See merge request gitlab-org/gitlab!20866

Delete any stale deploy access levels  by group

See merge request gitlab-org/gitlab!20689

Creating a test for `Contribution Analytics`

Closes gitlab-org/quality/testcases#121

See merge request gitlab-org/gitlab!19960

Reset all the commits into one collective commit that encompasses all
the work done.

Simplify test to avoid flakiness

Closes #37369

See merge request gitlab-org/gitlab!20931

Cache Repository#ancestor? on two levels

See merge request gitlab-org/gitlab!20958

We sometimes call this multiple times per request, and we also call
this from a polled endpoint. So caching it on both levels could
speed up a bunch of those polled requests

Update sitespeed to 11.2.0

See merge request gitlab-org/gitlab!20561

Use explicitly tracked deployments for MR widgets

See merge request gitlab-org/gitlab!20066

Move the `post-test` stage closer to the `test` stage

Closes #37375

See merge request gitlab-org/gitlab!20796

Correct redundant language

See merge request gitlab-org/gitlab!20965

Resolve "Add monitoring for diff limits"

Closes #31286

See merge request gitlab-org/gitlab!20022

Import large gitlab_project exports via rake task

See merge request gitlab-org/gitlab!20724

Link users to new Smartcards certificate ldap identities on login

Closes #36808

See merge request gitlab-org/gitlab!20470

This is caused by allowing to link existing accounts with new
smartcards with ldap certificates

Add Some Extra Documentation Around Mass Insert

See merge request gitlab-org/gitlab!20803

Including how to add a user as a maintainer to any number of the newly
inserted projects.

Run housekeeping after moving a repository between shards

See merge request gitlab-org/gitlab!20863

Squashing quite a few smaller fixes from review

We specifically only enable keyset pagination for reviewed endpoints and
order-by combinations (in this case Project and only ordering by id).

This assumes pagination always comes last and we don't have to return an
AR relation from the pagination code. Otherwise we'd have to perform two
queries.

Since we now support id_before/id_after and order_by id in asc/desc
order, we can just use that for keyset pagination.

First attempt of adding keyset pagination based on the id column.

Refactor slash commands presenters

Closes #35416

See merge request gitlab-org/gitlab!19947

Remove unnecessary existence check on persistent ref

See merge request gitlab-org/gitlab!20430

Fix error in updating runner session

Closes #34366

See merge request gitlab-org/gitlab!20902

Use Gitlab::SidekiqMiddleware.client_configurator

See merge request gitlab-org/gitlab!20773

The current inter-shard move is implemented as a `git fetch` from the
original shard to an empty repository on the new shard. The repository
on the new shard lacks bitmaps, and may be less well packed, than the
repository on the old shard. This has a measurable performance impact.

We may be changing from "FetchInternalRemote" to "ReplicateRepository"
in the future, but until then, forcing housekeeping to run is a good
performance optimisation - we trade off some short-term I/O load on the
new shard for better performance across a wide range of RPCs, including
an order-of-magnitude improvement in `IsAncestor`, which is the find
that motivated this change.

This test has been failing intermittently in the removed
assertions, but even with them removed, we are still testing the
functionality of relating and unrelating issues to each other, so,
better to have it testing less but providing a reliable result,
than testing more, and providing flaky results.

Replace OpenStruct in Ansi converters

See merge request gitlab-org/gitlab!20444

Clean Code: Improve JIRA API

See merge request gitlab-org/gitlab!20864