fofoj be3613593b test(oauth): update OAuth 401 tests to match new no-write behavior
Two tests in ratelimit_service_401_test.go were encoding the bug behavior
itself:

- OAuth401InvalidatorError asserted updateCredentialsCalls == 1
- OAuth401UsesCredentialsUpdater asserted updateCredentialsCalls == 1
  and lastCredentials["expires_at"] non-empty

Both assertions exercised the exact write-back this PR removes. Update
them to reflect the new contract and guard against regression:

- OAuth401InvalidatorError: assert updateCredentialsCalls == 0
- OAuth401UsesCredentialsUpdater is renamed to
  OAuth401DoesNotOverwriteCredentials with reversed assertions, so it
  now serves as a regression test ensuring the 401 handler never writes
  credentials back from the request-start snapshot.
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