Documentation for shared Runners build minutes quota

See merge request !1081

Revert "Merge branch 'dont-persist-application-settings-in-test-env-ee' into 'master'"

See merge request !1089

This reverts merge request !1056

Remove 2GB tag from CI

See merge request !1085

[ci skip]

[ci skip]

Deal with repository size limits as Bytes instead Megabytes

Closes #1541

See merge request !1067

[EE] Dont persist application settings in test env

See merge request !1056

Reduce DB-load for build-queues by storing last_update in Redis

See merge request !1083

CE upstream

Closes gitlab-ce#26762

See merge request !1075

Reduce DB-load for build-queues by storing last_update in Redis

See merge request !8084

[EE] Use `:empty_project` in Project, User, MergeRequest, and MoveToProjectFinder specs

See merge request !1079

Port of 26138-combine-webhooks-and-services-settings-pages to EE

See merge request !1076

Remove redundant `Repository#fetch_remote_forced!` method

Closes #1537

See merge request !1080

Document GIT_SUBMODULE_STRATEGY

See merge request !8586

Rename duplicate migrations and skip them if table/columns are already present

Closes #26868

See merge request !8644

We already have `#fetch_remote` which accepts a `forced` option and is
used in other sections of the codebase.

Introduce build minutes (again)

Closes #1405

See merge request !1078

The time tracking feature was backported from EE to CE, thus the CE
migrations should be uniquely named and should skip the actual migration
content if the table/columns already exist (that means that the EE
migrations were already performed).
Signed-off-by: Rémy Coutable <remy@rymai.me>