QL: initial query for detecting inconsistent alert messages

[erik-krogh]

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This PR mostly exists so I can get a .sarif file to play with.

The new query works across language implementations, so I had to change QL-for-QL to analyze all the languages in one go.

TODO:

• [ ] consider what the QL-for-QL query should look like
• [ ] fix inconsistent messages
• [ ] this PR is based on #9884, wait for that to merge.