sql: Clean up task/task_run data model

This archives current task and task_run tables, creating new ones filtering only
necessary tasks (last 2 months' oneshot tasks plus some recurring tasks; lister,
indexer, ...). Those filtered tasks are the ones scheduled by the runner and runner
priority services.

This archiving will allow those services to be faster (corresponding query execution
time will outputs results faster without the archived data).

Related to T3837