Disable autocompletions by default #4027

Job	Run time
lint	11s
Debug compatibility test	6m 8s
ruby-versions / Generate Ruby versions	1s
rake test 2.7 (latest reline)	1m 33s
vterm-yamatanooroti 2.7 (latest reline)	1m 8s
rake test 2.7	1m 32s
vterm-yamatanooroti 2.7	49s
rake test 3.0 (latest reline)	1m 27s
vterm-yamatanooroti 3.0 (latest reline)	43s
rake test 3.0	1m 30s
vterm-yamatanooroti 3.0	42s
rake test 3.1 (latest reline)	1m 36s
vterm-yamatanooroti 3.1 (latest reline)	47s
rake test 3.1	1m 27s
vterm-yamatanooroti 3.1	37s
rake test 3.2 (latest reline)	1m 22s
rake test 3.2	1m 20s
vterm-yamatanooroti 3.2 (latest reline)	40s
rake test 3.3 (latest reline)	1m 21s
vterm-yamatanooroti 3.2	40s
rake test 3.3	1m 20s
vterm-yamatanooroti 3.3 (latest reline)	37s
rake test head (latest reline)	1m 58s
vterm-yamatanooroti 3.3	39s
rake test head	1m 45s
vterm-yamatanooroti head (latest reline)	39s
rake test truffleruby-head (latest reline)	2m 50s
vterm-yamatanooroti head	38s
rake test truffleruby-head	2m 53s
	38m 53s

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