Revert "Custom setproctitle (#32667)"

This reverts commit 3365ed5eff.

common/threadname.py

@@ -1,19 +0,0 @@
-import ctypes
-import os
-
-LINUX = os.name == 'posix' and os.uname().sysname == 'Linux'
-
-if LINUX:
-  libc = ctypes.CDLL('libc.so.6')
-
-def setthreadname(name: str) -> None:
-  if LINUX:
-    name = name[:15] + '\0'
-    libc.prctl(15, str.encode(name), 0, 0, 0)
-
-def getthreadname() -> str:
-  if LINUX:
-    name = ctypes.create_string_buffer(16)
-    libc.prctl(16, name)
-    return name.value.decode('utf-8')
-  return ""