Task run heartbeats refactor #158
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Summary
This PR updates the zombie killer to rely on flow run heartbeats instead of individual task run heartbeats; we've found that task run heartbeat processes can be brittle and cause resource contention issues when working with thousands of parallel runs. In addition, if the Flow Run process dies then the task runs it submits also die, so this change should not affect behavior.
Importance
Performance improvement!
Checklist
This PR:
changes/directory (if appropriate)