Add last_cleanup_deleted_tag count column

What does this MR do and why?

This adds a last_cleanup_deleted_tag_count column to the ContainerRepository table, this gets updated every time the cleanup policy worker starts and finishes

#354494 (closed)

Migration info

Migrate up

$ bundle exec rails db:migrate
== 20220421180321 AddLastCleanupDeletedTagsCountToContainerRepository: migrating
-- add_column(:container_repositories, :last_cleanup_deleted_tags_count, :integer, {:default=>nil, :null=>true})
   -> 0.0042s

Migrate down

bundle exec rails db:rollback
 == 20220421180321 AddLastCleanupDeletedTagsCountToContainerRepository: reverting
-- remove_column(:container_repositories, :last_cleanup_deleted_tags_count, :integer, {:default=>nil, :null=>true})
   -> 0.0053s
== 20220421180321 AddLastCleanupDeletedTagsCountToContainerRepository: reverted (0.0078s)

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