Revert "Don't generate compiled bytecode files for skeleton generator in the application directory (PY-15907)"

This reverts commit d0dcd320d7.

python/helpers/generator3.py

@@ -1,12 +1,6 @@
 # encoding: utf-8
 import atexit
 import zipfile
-import sys
-
-
-if hasattr(sys, 'dont_write_bytecode'):
-    sys.dont_write_bytecode = True
-
 
 # TODO: Move all CLR-specific functions to clr_tools