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Part of #3551
This PR migrates
submitted_jobsbackground task to pipelines. The main behavioral change is that old task locked all project's instances before selecting fleets and held the lock during the entire instance assignment duration that includes long get offers calls. Now the fleet is selected without instance lock and instance lock is only acquired for the chosen fleet to select existing instance offer, which is quick. Otherwise it's mostly one-to-one migration with pipeline specifics such separate processing/apply phases.Known
submitted_jobsissues like #3665, #3663, #3603 are NOT fixed. I decided to fix them for pipelines only after dropping scheduled tasks altogether since they require changes across background tasks.