Fix when pushing without a branch name

Closes #3393

See merge request !2879

Geo - Ignore S3-backed LFS objects on secondary nodes

Closes #3371

See merge request !2889

Improve Geo repository sync performance for larger databases

Closes #3269

See merge request !2887

Document work around when upgrading to 9.3/9.4 for MySql instances.

Closes gitlab-ce#36422

See merge request !2897

Stop needing SSH keys for Geo primaries

Closes #3340

See merge request !2861

Pick a released security fix into master

See merge request !2895

Decrease Perceived and Cyclomatic Complexity

See merge request !2874

Make sure we validate the branch name being pushed even if no commits
are in the push.

Otherwise it would be possible to create branches that aren't supposed
to be allowed.

CE upstream: Friday

Closes gitaly#485, gitaly#530, #3352, gitlab-ce#37241, gitaly#520, gitlab-ce#37023, gitaly#521, #3125, gitaly#502, and gitlab-ce#36821

See merge request !2865

CSV export time tracking info docs

See merge request !2884

This fixed https://gitlab.com/gitlab-org/gitlab-ee/-/jobs/32313185
and this only happened on MySQL, because without this, the user
would have another namespace, and both namespaces are belonging
to the user here. However user.namespace would only return one
namespace, which one is database dependent. Even worse, since
there's no ORDER BY, it should be considered completely random.

We should refactor User#ensure_namespace_correct in the future.

Fix Issuable#labels_hash when filtered by multiple labels for CSV export

Closes gitlab-ce#34217

See merge request !2852

ObjectStoreUploader#migrate! uses with_callbacks to trigger verify_license!

Closes #3370

See merge request !2863

See https://gitlab.com/gitlab-org/gitlab-ee/issues/3417

Reset all connection schema cache after migration tests

See merge request !14195

Fix user access due to having multiple identities

See merge request !2886

Group issue board docs

See merge request !2882

based on https://gitlab.com/gitlab-org/gitlab-ce/commit/deaa7f54e016b6ae1051c38abb95586451f470c1

Add missing cascading deletes on foreign keys for group_id

Closes #3343, #3344, and gitlab-ce#37311

See merge request !2878

This is an attempt for the EE part for:
https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/12968

Fix links and typo

See merge request !2883