src: don't compare kv results

[flakey5]

No description provided.

[cursor]

PR Summary

Low Risk
Low risk: removes a background KV-vs-S3 directory listing comparison and its Sentry reporting without changing the primary readDirectory behavior.

Overview
Removes the temporary background check in R2Provider.readDirectory that compared the resolved directory listing against KvProvider and reported mismatches/errors to Sentry.

The provider now simply returns the cached/S3 result (or KV when USE_KV is enabled) without any asynchronous verification side effects.

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[cursor]

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