Restore retries for stores to remote REAPI byte stores (Cherry-pick of #19737) #19798
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This fixes #19732 by restoring the retries when storing hits retryable server failures from the REAPI remote cache server, which were lost in the #19050 refactoring. This also explicitly tests for retries, refactoring `StubCAS` to generalise `read_request_count` to expose the counts of more requests than just reads, and also consistently return a `Status::internal(...)` for the simulated errors. I think #19050 fortunately landed just after 2.17 was cut, so this regression only affects the 2.18 pre-releases.
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This fixes #19732 by restoring the retries when storing hits retryable server failures from the REAPI remote cache server, which were lost in the #19050 refactoring.
This also explicitly tests for retries, refactoring
StubCASto generaliseread_request_countto expose the counts of more requests than just reads, and also consistently return aStatus::internal(...)for the simulated errors.I think #19050 fortunately landed just after 2.17 was cut, so this regression only affects the 2.18 pre-releases.