Deprecate RubyLex and warn about referencing to it #2449

Job	Run time
ruby-versions / Generate Ruby versions	3s
vterm-yamatanooroti 2.7 (latest reline)	2m 24s
vterm-yamatanooroti 2.7	2m 32s
vterm-yamatanooroti 3.0 (latest reline)	1m 23s
vterm-yamatanooroti 3.0	51s
vterm-yamatanooroti 3.1 (latest reline)	2m 12s
vterm-yamatanooroti 3.1	1m 20s
vterm-yamatanooroti 3.2 (latest reline)	1m 41s
vterm-yamatanooroti 3.2	2m 22s
vterm-yamatanooroti head (latest reline)	55s
vterm-yamatanooroti head	1m 30s
rake test 2.7 (latest reline)	1m 22s
rake test 2.7	56s
rake test 3.0 (latest reline)	54s
rake test 3.0	44s
rake test 3.1 (latest reline)	59s
rake test 3.1	1m 0s
rake test 3.2 (latest reline)	57s
rake test 3.2	41s
rake test head (latest reline)	42s
rake test head	51s
rake test truffleruby-head (latest reline)	5m 35s
rake test truffleruby-head	8m 42s
	40m 36s

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