introduce a new compilation-mode for rust-format #276

Job	Run time
test (ubuntu-latest, 28.2)	48s
test (ubuntu-latest, 29.1)	42s
test (ubuntu-latest, 29.2)	1m 13s
test (ubuntu-latest, 29.3)	1m 0s
test (macos-latest, 28.2)	2m 19s
test (macos-latest, 29.1)	2m 25s
test (macos-latest, 29.2)	2m 49s
test (macos-latest, 29.3)	2m 48s
test (windows-latest, 28.2)	1m 59s
test (windows-latest, 29.1)	2m 16s
test (windows-latest, 29.2)	2m 43s
test (windows-latest, 29.3)	3m 23s
test (ubuntu-latest, snapshot, true)	42s
test (macos-latest, snapshot, true)	2m 15s
	27m 22s

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