Fix minion process name pollution and improve process title visibility #68554
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Fix process name pollution when multiprocessing=False (issue [BUG] Minions append to parent process name when multiprocessing=False #68553) Skip appending _thread_return to process title when jobs run in threads instead of separate processes to prevent indefinite name accumulation
Allow minion process managers to append their name even in MainProcess Ensures MinionProcessManager appears in process title when running with --disable-keepalive for better process identification
Add integration tests for process name behavior Tests verify no _thread_return pollution and proper ProcessManager naming
Fixes #68553