Let's upgrade log levels of some noteworthy messages from LOG_DEBUG to LOG_NOTICE. These messages contain information that previous log messages in the error path didn't say, namely that we'll now fall back to traditional unlocking. Note that this leaves similar log messages for cases where TPM2/PKCS#11/FIDO2 support is disabled at build at LOG_DEBUG, since in that case nothing really failed, we just systematically can't do TPM2/PKCS#11/FIDO2 and hence it is pointless and not actionable for users to do anything about it...
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