Docs: Create new doc for connecting clusters

See merge request gitlab-org/gitlab!69309

- Create a new page `clusters/connect/index.md`
- Move content from the overview page to the new page
- Improve the content of the new page
- Ref: https://gitlab.com/gitlab-org/gitlab/-/issues/337297
- Ref: https://gitlab.com/groups/gitlab-org/-/epics/6499

Remove custom getter methods for secondary emails

See merge request gitlab-org/gitlab!69648

Make it clear where a default value is potentailly used
for `commit_email` or `notification_email`.

Revert "Build qa-image with buildkit"

See merge request gitlab-org/gitlab!70176

Retain non-empty partitions

See merge request gitlab-org/gitlab!69850

Increase the expiration time for the merge request api cache

See merge request gitlab-org/gitlab!70267

OKR: Admin Area-Network/ Package Registry Rate Limits

See merge request gitlab-org/gitlab!70137

Update error messaging to indicate file extension rather than MIME type

See merge request gitlab-org/gitlab!70374

Remove FF ci_daily_limit_for_pipeline_schedules

See merge request gitlab-org/gitlab!70163

Add missing tiers to api/groups endpoints

See merge request gitlab-org/gitlab!69687

Ensure ProjectNamespace is destroyed along with Project

See merge request gitlab-org/gitlab!69200

Document and enable failed DAST site validations

See merge request gitlab-org/gitlab!57847

Merge `data_available` and `implemented` statuses into `active`

See merge request gitlab-org/gitlab!69573

Rebalance without transaction

See merge request gitlab-org/gitlab!68746

Add status filter to project.dastSiteValidations

See merge request gitlab-org/gitlab!70126

Docs: Clarify deprecation clusters certificates

See merge request gitlab-org/gitlab!69775

Custom emoji delete gql api

See merge request gitlab-org/gitlab!65387

Enable `performance_roadmap` feature flag by default

See merge request gitlab-org/gitlab!70364

Docs: CTRT and clarity review of Cluster Mgm project docs

See merge request gitlab-org/gitlab!69695

Format VSA version history correctly

See merge request gitlab-org/gitlab!70377

Simplify example manifest

See merge request gitlab-org/gitlab!70135

- Simplify and clarify the instructions
- CTRT review

Enable Roadmap daterange presets by default

See merge request gitlab-org/gitlab!70370

Fix Web IDE terminal button on relative URL root

See merge request gitlab-org/gitlab!70355

Allow deprecations doc pipeline check to fail

See merge request gitlab-org/gitlab!70368

Extend `marginalia` to provide `db_config_name`

See merge request gitlab-org/gitlab!67328

Clarified some backend code comments

See merge request gitlab-org/gitlab!70227

create_table with text limits

See merge request gitlab-org/gitlab!69304

I've added a /lib/gitlab/issues/ module so now any usages of
Issues::Smth wihthin /lib/gitlab/issues/* will look for Smth
within /lib/gitlab/issues folder, so we need to change those
usages to resolve to the external definitions outside of
/lib/gitlab/

Refactor group issues page from Haml to Vue

See merge request gitlab-org/gitlab!68978

Update docs for lock-retries method

See merge request gitlab-org/gitlab!69873