Disable pager when TERM is not set too #2954

Job	Run time
ruby-versions / Generate Ruby versions	3s
rake test 2.7 (latest reline)	58s
rake test 2.7	1m 0s
rake test 3.0 (latest reline)	51s
vterm-yamatanooroti 2.7 (latest reline)	1m 15s
rake test 3.0	50s
vterm-yamatanooroti 2.7	1m 17s
rake test 3.1 (latest reline)	1m 5s
vterm-yamatanooroti 3.0 (latest reline)	56s
rake test 3.1	50s
vterm-yamatanooroti 3.0	1m 10s
rake test 3.2 (latest reline)	48s
vterm-yamatanooroti 3.1 (latest reline)	56s
rake test 3.2	50s
vterm-yamatanooroti 3.1	59s
vterm-yamatanooroti 3.2 (latest reline)	2m 9s
rake test head (latest reline)	52s
rake test head	57s
vterm-yamatanooroti 3.2	58s
rake test truffleruby-head (latest reline)	2m 46s
vterm-yamatanooroti head (latest reline)	47s
rake test truffleruby-head	2m 36s
vterm-yamatanooroti head	50s
	25m 43s

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