Add retention policy for cached content and media (#19232)

app/lib/redis_configuration.rb

app/lib/vacuum.rb

app/lib/vacuum/access_tokens_vacuum.rb

app/lib/vacuum/backups_vacuum.rb

app/lib/vacuum/feeds_vacuum.rb

app/lib/vacuum/media_attachments_vacuum.rb

app/lib/vacuum/preview_cards_vacuum.rb

app/lib/vacuum/statuses_vacuum.rb

app/lib/vacuum/system_keys_vacuum.rb

app/models/content_retention_policy.rb

app/models/form/admin_settings.rb

app/views/admin/settings/edit.html.haml

app/workers/scheduler/backup_cleanup_scheduler.rb

app/workers/scheduler/feed_cleanup_scheduler.rb

app/workers/scheduler/media_cleanup_scheduler.rb

app/workers/scheduler/vacuum_scheduler.rb

config/locales/simple_form.en.yml

config/settings.yml

config/sidekiq.yml

spec/fabricators/access_grant_fabricator.rb