[8.1.0] Implement an idle task to garbage collect stale install bases. #25117
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The
--experimental_install_base_gc_max_age
flag determines the criteria for considering an install base stale; zero disables garbage collection. The default will be replaced with a suitable nonzero value in a future CL.Progress on #2109.
PiperOrigin-RevId: 705874241
Change-Id: I3c8526a4a0e20a12d52c08cb282f24e268cbc633