Ruby

Refactor comment collection in get_rbs_comment_before #1270

Job	Run time
ruby-versions / Generate Ruby versions	6s
build (3.3)	52s
build (head)	47s
build (truffleruby)	38s
build (3.4)	52s
build (4.0)	51s
build (truffleruby-head)	38s
	4m 44s

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