Ruby

Make the severity of diagnostics configurable #1035

Job	Run time
ruby-versions / Generate Ruby versions	4s
build (3.2)	37s
build (3.3)	38s
build (3.4)	34s
build (head)	38s
build (truffleruby)	26s
build (truffleruby-head)	28s
	3m 25s

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