Log debug information upon possible secret key corruption

[nscuro]

Description

Logs debug information upon possible secret key corruption.

I was not able to reproduce the issue in question, so it's impossible to know why some users are experiencing secret decryption failures out of the blue.

If for whatever reason the secret key in-memory gets corrupted, we now try to reload it from disk once, and log a warning about it.

If on the other hand the encrypted value itself got corrupted (perhaps due to some bug in DataNucleus), we log a warning about that as well.

In both cases, the warning logs contain a reference to issue #2366.

Addressed Issue

Relates to #2366

Additional Details

Checklist

• I have read and understand the contributing guidelines
• This PR fixes a defect, and I have provided tests to verify that the fix is effective
• This PR implements an enhancement, and I have provided tests to verify that it works as intended
• This PR introduces changes to the database model, and I have added corresponding update logic
• This PR introduces new or alters existing behavior, and I have updated the documentation accordingly

[codacy-production]

Coverage summary from Codacy

See diff coverage on Codacy

Coverage variation	Diff coverage
✅ +0.00% (target: -1.00%)	✅ 70.00% (target: 70.00%)

Coverage variation details

	Coverable lines	Covered lines	Coverage
Common ancestor commit (7404d62)	21988	16469	74.90%
Head commit (05afa08)	22018 (+30)	16491 (+22)	74.90% (+0.00%)

Coverage variation is the difference between the coverage for the head and common ancestor commits of the pull request branch: <coverage of head commit> - <coverage of common ancestor commit>

Diff coverage details

	Coverable lines	Covered lines	Diff coverage
Pull request (#3651)	40	28	70.00%

Diff coverage is the percentage of lines that are covered by tests out of the coverable lines that the pull request added or modified: <covered lines added or modified>/<coverable lines added or modified> * 100%

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