build

Finish support for insert_final_newline #317

Job	Run time
test (ubuntu-latest, 28.2, false)	48s
test (ubuntu-latest, 29.3, false)	1m 26s
test (macos-latest, 28.2, false)	1m 30s
test (macos-latest, 29.3, false)	2m 0s
test (windows-latest, 28.2, false)	2m 4s
test (windows-latest, 29.3, false)	1m 15s
test (ubuntu-latest, 26.3, false)	57s
test (windows-latest, 26.3, false)	2m 48s
test (ubuntu-latest, 27.2, false)	47s
test (windows-latest, 27.2, false)	2m 28s
test (ubuntu-latest, snapshot, true)	41s
test (macos-latest, snapshot, true)	1m 38s
	18m 22s

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