Make sure isolated envelopes respect enabled_environments #2461

Job	Run time
ruby-versions / Generate Ruby versions	2s
Ruby 2.4, options - null	2m 59s
Ruby 2.5, options - null	2m 13s
Ruby 2.6, options - null	2m 2s
Ruby 2.7, options - null	54s
Ruby 3.0, options - null	49s
Ruby 3.1, options - null	2m 24s
Ruby 3.2, options - { "codecov": 1 }	44s
Ruby 3.3, options - null	1m 30s
Ruby jruby, options - null	2m 21s
Ruby jruby-head, options - null	1m 21s
	17m 19s

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