Deprecate RubyLex and warn about referencing to it #2450

Job	Run time
ruby-versions / Generate Ruby versions	2s
vterm-yamatanooroti 2.7 (latest reline)	1m 24s
vterm-yamatanooroti 2.7	2m 57s
vterm-yamatanooroti 3.0 (latest reline)	2m 36s
vterm-yamatanooroti 3.0	52s
vterm-yamatanooroti 3.1 (latest reline)	47s
vterm-yamatanooroti 3.1	1m 48s
vterm-yamatanooroti 3.2 (latest reline)	1m 22s
vterm-yamatanooroti 3.2	51s
vterm-yamatanooroti head (latest reline)	42s
vterm-yamatanooroti head	3m 7s
rake test 2.7 (latest reline)	1m 12s
rake test 2.7	55s
rake test 3.0 (latest reline)	59s
rake test 3.0	40s
rake test 3.1 (latest reline)	53s
rake test 3.1	43s
rake test 3.2 (latest reline)	42s
rake test 3.2	43s
rake test head (latest reline)	54s
rake test head	53s
rake test truffleruby-head (latest reline)	5m 23s
rake test truffleruby-head	8m 5s
	38m 30s

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