[8.4.0] Disallow output bases under GC-able directories #26596
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We have had user's report spurious build failures due to the disk cache GC collecting files under the output base when output base and disk cache were set up at the same path.
Closes #26138.
PiperOrigin-RevId: 785412502
Change-Id: I44865ce44782a21a4cc15b61f0e0c9d4f13ea194
Commit 216d333