Remove inline tier badges

Create the add videos to continuous onboarding experiment

See merge request gitlab-org/gitlab!82274

- Create video_tutorials_continuous_onboarding experiment feature flag
- Publish experiment in LearnGitlabController
- Add a button top open videos in a new tab from learn_gitlab
- Track click to video in candidate flow of experiment
- Make learn_gitlab_section_card responsive
- Update snaphost & unit tests for learn_gitlab

Add feature flag info to incident escalation docs

See merge request gitlab-org/gitlab!83122

It was expected that this feature would be enabled earlier, but that 
didn't ultimately happen. This updates the documentation to reflect the 
current state and expected functionality.

Quarantining pipeline creation test

See merge request gitlab-org/gitlab!83219

Alias user_email_lookup_limit to search_rate_limit

See merge request gitlab-org/gitlab!83213

Changelog: changed

Add single db variant of partitioning rake tasks

See merge request gitlab-org/gitlab!82717

Move Layout/FirstHashElementIndentation into a separate TODO file

See merge request gitlab-org/gitlab!82605

Move updating statistics logic outside of the transaction

See merge request gitlab-org/gitlab!83018

Make 'development panel' consistent in docs

See merge request gitlab-org/gitlab!83171

Move Layout/HashAlignment into a separate file

See merge request gitlab-org/gitlab!82606

Remove gitlab_transaction_queue_duration_total

See merge request gitlab-org/gitlab!83161

Add proofreader for Bosnian/Croatian/Serbian

See merge request gitlab-org/gitlab!83136

Changelog: performance
EE: true

Add migration_plan to container_repositories

See merge request gitlab-org/gitlab!83061

Add test report widget using new framework

See merge request gitlab-org/gitlab!83039

Move Layout/FirstArrayElementIndentation into a separate TODO

See merge request gitlab-org/gitlab!82601

Removed fetching unused properties for subscription

See merge request gitlab-org/gitlab!83053

- users was not used anywhere for addon purchase
- guests used to be used by new subscription but we no longer need it

Add not_connected to Runner status docs

See merge request gitlab-org/gitlab!83096

Add column to store migration_plan in container_repositories
to be used when scheduling the phase 2 registry migration.

Changelog: other

Look for existing users by email and cache in member add process

See merge request gitlab-org/gitlab!82196

- reduce queries
- add query counter

Changelog: performance

Resolve "Support multiple databases for batched background migrations"

See merge request gitlab-org/gitlab!83109

Implement test report widget using merge request report
widget extension framework, only levels 1 and 2 for now
Import and register extension
Add tests for widget functionality

Abort long running registry migrations

See merge request gitlab-org/gitlab!81938

Enable service ping for error tracking features

See merge request gitlab-org/gitlab!83148

Fix merge request widget extension expand click listener bug

See merge request gitlab-org/gitlab!83114

Handle 404 responses from the container registry import status API

See merge request gitlab-org/gitlab!83070

Allow administrators to change plan limits via the UI

See merge request gitlab-org/gitlab!82521

`Admin Area > CI/CD > Continuous Integration and Deployment` now
has a section to inspect and edit the each CI/CD plan limit.

Changelog: added