Fix TOCTOU failure in DiskCacheClient (https://github.com/bazelbuild/bazel/pull/30835) ### Description A concurrent garbage collection can delete disk cache entries in the window between the existence check and the read or copy of the entry, which resulted in a generic I/O error when it should be treated just like a cache miss. ### Motivation ### Build API Changes No ### Checklist - [x] I have added tests for the new use cases (if any). - [ ] I have updated the documentation (if applicable). ### Release Notes RELNOTES: Disk cache entries deleted by a concurrent garbage collection are now treated as cache misses and don't result in failures. Closes #30835. PiperOrigin-RevId: 976262707 Change-Id: I3af549543344efca2b2c3c42f2db1c3959e91901
{Fast, Correct} - Choose two
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