Ruby

Make the severity of diagnostics configurable #1046

Job	Run time
ruby-versions / Generate Ruby versions	2s
build (3.2)	37s
build (3.3)	49s
build (3.4)	46s
build (head)	36s
build (truffleruby)	33s
build (truffleruby-head)	27s
	3m 50s

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