Remove exit command workaround, handle IRB_EXIT in debug_readline #3589

Job	Run time
Debug compatibility test	6m 9s
lint	11s
ruby-versions / Generate Ruby versions	7s
rake test 2.7 (latest reline)	1m 18s
rake test 2.7	1m 17s
vterm-yamatanooroti 2.7 (latest reline)	1m 5s
rake test 3.0 (latest reline)	1m 13s
vterm-yamatanooroti 2.7	2m 10s
rake test 3.0	1m 18s
vterm-yamatanooroti 3.0 (latest reline)	1m 54s
rake test 3.1 (latest reline)	1m 12s
vterm-yamatanooroti 3.0	1m 4s
rake test 3.1	1m 12s
vterm-yamatanooroti 3.1 (latest reline)	1m 27s
rake test 3.2 (latest reline)	1m 7s
vterm-yamatanooroti 3.1	58s
rake test 3.2	1m 16s
vterm-yamatanooroti 3.2 (latest reline)	53s
rake test 3.3 (latest reline)	1m 17s
vterm-yamatanooroti 3.2	1m 4s
rake test 3.3	1m 24s
vterm-yamatanooroti 3.3 (latest reline)	59s
rake test head (latest reline)	1m 18s
vterm-yamatanooroti 3.3	54s
rake test head	1m 21s
vterm-yamatanooroti head (latest reline)	57s
rake test truffleruby-head (latest reline)	2m 38s
vterm-yamatanooroti head	1m 4s
rake test truffleruby-head	2m 43s
	41m 30s

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