Support repeating debugger input by passing empty input to it #3335

Job	Run time
lint	8s
ruby-versions / Generate Ruby versions	1s
vterm-yamatanooroti 2.7 (latest reline)	1m 11s
rake test 2.7 (latest reline)	1m 10s
vterm-yamatanooroti 2.7	1m 7s
vterm-yamatanooroti 3.0 (latest reline)	54s
vterm-yamatanooroti 3.0	53s
rake test 2.7	1m 8s
vterm-yamatanooroti 3.1 (latest reline)	54s
rake test 3.0 (latest reline)	1m 10s
vterm-yamatanooroti 3.1	1m 15s
rake test 3.0	1m 4s
vterm-yamatanooroti 3.2 (latest reline)	56s
rake test 3.1 (latest reline)	1m 5s
rake test 3.1	1m 6s
vterm-yamatanooroti 3.2	50s
rake test 3.2 (latest reline)	1m 4s
rake test 3.2	1m 2s
vterm-yamatanooroti 3.3 (latest reline)	58s
rake test 3.3 (latest reline)	1m 10s
vterm-yamatanooroti 3.3	50s
rake test 3.3	1m 8s
vterm-yamatanooroti head (latest reline)	57s
rake test head (latest reline)	1m 13s
vterm-yamatanooroti head	53s
rake test head	1m 9s
rake test truffleruby-head (latest reline)	2m 40s
rake test truffleruby-head	2m 35s
	30m 31s

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