Increase speed of the deletion service.

On large instances of PostgreSql (with many plans) findPlanKeysFromAllOrphanedResultSummaries query runs very slow. It may be similar on other type of databases but it hasn't been confirmed.

Proposed solution is to remember builds remove in job so we don't search for them when removing build results.
After that create second job to run generic old removal of orphaned build results, but run lest often (proposed: daily)