Backport of Log, don't err, on unified delta WAL write failure into release/1.13.x #20074
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Backport
This PR is auto-generated from #20057 to be assessed for backporting due to the inclusion of the label backport/1.13.x.
The below text is copied from the body of the original PR.
When the PBPWF fails on the Active node of a PR Secondary cluster with a read-only failure, there is no value in forwarding this request up to the Active node of the PR Primary cluster: it does not have the local revocation context necessary to write a Delta WAL entry for this request, and would likely end up writing a cross-cluster revocation entry (if it is enabled) or else erring completely.
Instead, log this error like we do when failing to write unified CRL entries. Switch both to using Error instead of Debug for this type of failure.
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