Introduce feature flag to allow gradually rolling out separate read-write (primary) connection for ci database (Phase 4)

See merge request gitlab-org/gitlab!76188

Per our rollout plan https://gitlab.com/groups/gitlab-org/-/epics/6160
of separating the CI database from the main database the "phase 4" will
involve gradually changing a percentage of "read-write" (primary)
traffic to go through a new connection that still points to the same
database.

Previously we added the `GITLAB_LOAD_BALANCING_REUSE_PRIMARY_ci`
environment variable to allow us to share the same primary connection
when there is a separate `ci` entry in `config/database.yml`. But we
need to a way to override this environment variable so this MR
introduces a new feature flag `force_no_sharing_primary_model` which
overrides the "reuse" connection and forces it to not reuse the
connection.

Remove api_caching_merge_requests feature flag

See merge request gitlab-org/gitlab!80609

Split CiRunnerTokenAuthor class

See merge request gitlab-org/gitlab!80621

This allows representing different types of runner tokens, e.g.
authentication and registration tokens.

Clean up wrong max_seats_used batch two

See merge request gitlab-org/gitlab!79705

First batch of wrong max_seats_used cleanup was done by a previous MR
https://gitlab.com/gitlab-org/gitlab/-/merge_requests/78107.
This MR is the second batch, which aims to clean up all remaining ones.

https://gitlab.com/gitlab-org/gitlab/-/merge_requests/78107 has covered
gitlab_subscriptions with start_date >= 02-Aug-2021. This MR covers
gitlab_subscriptions with start_date < 02-Aug-2021.

Changelog: fixed

Updated the docs to include new agent information

See merge request gitlab-org/gitlab!80748

As we added the new column to the agents' list
that shows the agent's version,
we need to update the corresponding docs.

Changelog: changed

Roadmap settings documentation

See merge request gitlab-org/gitlab!80254

Document sidebar behind roadmap_settings feature flag

Provide FF to project edit action

See merge request gitlab-org/gitlab!80805

Remove mention of Reporter role being required for time tracking

See merge request gitlab-org/gitlab!80737

API: Add functionality for runner token expiration

See merge request gitlab-org/gitlab!78941

When a runner's authentication token is reset, or when the runner
is created, the API also returns the token_expires_at field.

Updated GraphQL frontend development guidelines for Apollo 3

See merge request gitlab-org/gitlab!80602

Added missing button variant to remove licence modal

See merge request gitlab-org/gitlab!80719

Replace "Approve users in" with "Approve users with"

See merge request gitlab-org/gitlab!79167

Changelog: changed
EE: true

Update Gitaly version

See merge request gitlab-org/gitlab!80803

Move traversal_ids update to the end of transaction

See merge request gitlab-org/gitlab!79964

Fix yamllint violations in metrics yamls

See merge request gitlab-org/gitlab!80703

Remove api_caching_rate_limit_repository_compare feature flag

See merge request gitlab-org/gitlab!80624

Merge branch '337720-storage-feature-flag-remove-the-new_route_storage_purchase-feature-flag' into 'master'

Resolve "[Storage] [Feature flag] Remove the 'new_route_storage_purchase' feature flag"

See merge request gitlab-org/gitlab!80568

- Rename buy_addon_target to be buy_addon_target_attr
- Add logic to open Customers Portal storage purchase link in new tab

Changelog: other

Contributes to https://gitlab.com/gitlab-org/gitlab/-/issues/350596

We have an approval form not only for merge requests but also for
project itself.

Changelog: added
EE: true

Add jobs template for Dependency Scanning and License Scanning

See merge request gitlab-org/gitlab!79454

Point Security/Dependency-Scanning.gitlab-ci.yml to newly added
Jobs/Dependency-Scanning.gitlab-ci.yml
Point Security/License-Scanning.gitlab-ci.yml to newly added
Jobs/License-Scanning.gitlab-ci.yml

Changelog: changed

Add troubleshooting for protected jobs as admin

See merge request gitlab-org/gitlab!78453

Merge branch '351878-spec-failure-in-spec-features-issues-user_interacts_with_awards_spec-rb-user-interacts-with' into 'master'

Fix quarantined custom award emoji spec

See merge request gitlab-org/gitlab!79906

Add missing Vue app names for apps within Product Planning

See merge request gitlab-org/gitlab!80797

Integrate deploy boards into new environments page

See merge request gitlab-org/gitlab!79759

Move push rules page to better spot

See merge request gitlab-org/gitlab!80242

This page is weirdly misplaced and mis-named; let's move it into
the repository subfolder where it belongs.

Fix issue position when creating issue in issue boards

See merge request gitlab-org/gitlab!80429