Resolve "Fail the execution of a batched background migration when too many jobs fail"

What does this MR do and why?

Pause the execution of a batched background migration when too many jobs fail

• BatchedMigration model starts to use state_machine to manage states and events.
• BatchedMigration has a new column (starts_at). When we perform the event execute, the system updates the starts_at with the current time.
• BatchedMigrationRunner stops the migration when a certain number of failed jobs is achieved (*)

Note: (*)

• If we re-run the migration, the system does not count the old jobs
• The system fails the migration when threshold > (failed_jobs / total_jobs). Currently, the threshold is 5%

up:

== 20220321150028 AddStartedAtToBatchedBackgroundMigrationsTable: migrating ===
-- add_column(:batched_background_migrations, :starts_at, :datetime_with_timezone)
   -> 0.0025s
== 20220321150028 AddStartedAtToBatchedBackgroundMigrationsTable: migrated (0.0025s)

down:

== 20220321150028 AddStartedAtToBatchedBackgroundMigrationsTable: reverting ===
-- remove_column(:batched_background_migrations, :starts_at, :datetime_with_timezone)
   -> 0.0103s
== 20220321150028 AddStartedAtToBatchedBackgroundMigrationsTable: reverted (0.0129s)

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Related to #355975 (closed)