feat: provide custom variable for diagnosticSeverityOverrides (#105) #124

Job	Run time
test (ubuntu-latest, 27.2, false)	43s
test (ubuntu-latest, 28.2, false)	46s
test (ubuntu-latest, 29.4, false)	53s
test (macos-latest, 28.2, false)	1m 31s
test (macos-latest, 29.4, false)	1m 39s
test (windows-latest, 27.2, false)	1m 35s
test (windows-latest, 28.2, false)	1m 2s
test (windows-latest, 29.4, false)	1m 8s
test (ubuntu-latest, snapshot, true)	39s
test (macos-latest, snapshot, true)	1m 33s
test (windows-latest, snapshot, true)	2m 13s
	13m 42s

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