[Python]: Fix: Adding Observability + Failure Handling (#1701)

* feat: simple thread pool monitoring job

* feat: sdk-side workflow pause

* Revert "feat: sdk-side workflow pause"

This reverts commit 83b4a63c20.

* feat: set stop signal to stop accepting new work

* proposal: no-op healthcheck workflow

* Revert "proposal: no-op healthcheck workflow"

This reverts commit f651a52137.

* fix: rm removed concurrency strats

* chore: ver

* fix: rm heartbeat wf

* fix: rm zombie keys

* fix: hint on invalid token

* fix: flaky test

* fix: rm buggy / dead code

sdks/python/examples/priority/test_priority.py

@@ -278,7 +278,7 @@ async def crons(
 
 def time_until_next_minute() -> float:
     now = datetime.now()
-    next_minute = now.replace(second=0, microsecond=0, minute=now.minute + 1)
+    next_minute = (now + timedelta(minutes=1)).replace(second=0, microsecond=0)
 
     return (next_minute - now).total_seconds()