Remove truffleruby-head from the default CI workflow #4092

Job	Run time
Debug compatibility test	5m 48s
lint	10s
ruby-versions / Generate Ruby versions	2s
vterm-yamatanooroti 2.7 (latest reline)	44s
rake test 2.7 (latest reline)	1m 35s
vterm-yamatanooroti 2.7	1m 13s
rake test 2.7	1m 35s
vterm-yamatanooroti 3.0 (latest reline)	35s
rake test 3.0 (latest reline)	1m 38s
vterm-yamatanooroti 3.0	33s
rake test 3.0	1m 30s
vterm-yamatanooroti 3.1 (latest reline)	39s
rake test 3.1 (latest reline)	1m 26s
vterm-yamatanooroti 3.1	36s
rake test 3.1	1m 24s
vterm-yamatanooroti 3.2 (latest reline)	39s
rake test 3.2 (latest reline)	1m 26s
vterm-yamatanooroti 3.2	34s
rake test 3.2	1m 33s
vterm-yamatanooroti 3.3 (latest reline)	27s
rake test 3.3 (latest reline)	1m 21s
vterm-yamatanooroti 3.3	35s
rake test 3.3	1m 23s
vterm-yamatanooroti head (latest reline)	38s
rake test head (latest reline)	1m 49s
vterm-yamatanooroti head	39s
rake test head	1m 45s
	32m 17s

Provide feedback