Pager should be disabled when TERM=dumb #2946

Job	Run time
ruby-versions / Generate Ruby versions	1s
vterm-yamatanooroti 2.7 (latest reline)	1m 17s
rake test 2.7 (latest reline)	56s
vterm-yamatanooroti 2.7	1m 18s
rake test 2.7	59s
vterm-yamatanooroti 3.0 (latest reline)	57s
rake test 3.0 (latest reline)	50s
vterm-yamatanooroti 3.0	56s
rake test 3.0	50s
vterm-yamatanooroti 3.1 (latest reline)	1m 1s
rake test 3.1 (latest reline)	52s
vterm-yamatanooroti 3.1	57s
rake test 3.1	54s
vterm-yamatanooroti 3.2 (latest reline)	56s
rake test 3.2 (latest reline)	50s
rake test 3.2	51s
rake test head (latest reline)	51s
rake test head	54s
rake test truffleruby-head (latest reline)	2m 38s
vterm-yamatanooroti 3.2	1m 0s
rake test truffleruby-head	2m 36s
vterm-yamatanooroti head (latest reline)	48s
vterm-yamatanooroti head	49s
	24m 1s

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