feat: append LSP diagnostic codes to flymake messages #6357

Job	Run time
test (ubuntu-24.04-arm, 30.2, false)	3m 54s
test (ubuntu-24.04-arm, 28.2, false)	3m 55s
test (ubuntu-latest, 28.2, false)	2m 40s
test (ubuntu-24.04-arm, 29.4, false)	3m 58s
test (ubuntu-latest, 29.4, false)	2m 21s
test (macos-latest, 29.4, false)	5m 23s
test (windows-latest, 28.2, false)	4m 7s
test (macos-latest, 30.2, false)	4m 20s
test (windows-latest, 29.4, false)	3m 46s
test (windows-latest, 30.2, false)	3m 52s
test (ubuntu-latest, snapshot, true)	1m 49s
test (ubuntu-latest, 30.2, false)	2m 17s
test (macos-latest, 28.2, false)	6m 47s
test (ubuntu-24.04-arm, snapshot, true)	5m 22s
test (windows-latest, snapshot, true)	3m 46s
test (macos-latest, snapshot, true)	4m 22s
	1h 2m 39s

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