Convert a few more diagnostics to reports #16065
                
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This is the version of #16066 that has a group for each message (i.e. a group with a
WARNINGprimary title followed by groups withNOTEsecondary titles).I was a bit surprised to see that (like the single-group version) this has a blank line before the note. Based on this comment I was expecting it not to.
This is part of #15944