Make colorize test pass with NO_COLOR env set #3916

Job	Run time
lint	9s
Debug compatibility test	5m 47s
ruby-versions / Generate Ruby versions	4s
rake test 2.7 (latest reline)	1m 31s
vterm-yamatanooroti 2.7 (latest reline)	1m 9s
rake test 2.7	1m 35s
vterm-yamatanooroti 2.7	1m 20s
rake test 3.0 (latest reline)	1m 28s
vterm-yamatanooroti 3.0 (latest reline)	55s
rake test 3.0	1m 29s
vterm-yamatanooroti 3.0	50s
rake test 3.1 (latest reline)	1m 30s
vterm-yamatanooroti 3.1 (latest reline)	1m 15s
rake test 3.1	1m 35s
vterm-yamatanooroti 3.1	1m 28s
rake test 3.2 (latest reline)	1m 28s
vterm-yamatanooroti 3.2 (latest reline)	1m 13s
rake test 3.2	1m 22s
vterm-yamatanooroti 3.2	1m 4s
rake test 3.3 (latest reline)	1m 27s
vterm-yamatanooroti 3.3 (latest reline)	1m 3s
rake test 3.3	1m 32s
vterm-yamatanooroti 3.3	51s
rake test head (latest reline)	1m 40s
vterm-yamatanooroti head (latest reline)	59s
rake test head	1m 36s
vterm-yamatanooroti head	57s
rake test truffleruby-head (latest reline)	2m 50s
rake test truffleruby-head	2m 44s
	42m 51s

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