♻️✅ Refactor SequenceSet enumerator tests #1824

Job	Run time
ruby-versions / Generate Ruby versions	4s
build (3.1 / ubuntu-latest)	37s
build (3.1 / macos-latest)	24s
build (3.1 / windows-latest)	2m 2s
build (3.2 / ubuntu-latest)	40s
build (3.2 / macos-latest)	23s
build (3.2 / windows-latest)	1m 44s
build (3.3 / ubuntu-latest)	36s
build (3.3 / macos-latest)	25s
build (3.3 / windows-latest)	4m 32s
build (3.4 / ubuntu-latest)	46s
build (3.4 / macos-latest)	30s
build (3.4 / windows-latest)	3m 42s
build (head / ubuntu-latest)	39s
build (head / macos-latest)	32s
build (head / windows-latest)	2m 54s
	20m 30s

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