Allow UCM commands to have “unprocessed” arguments #10175

Job	Run time
ormolu	13s
build ucm (ubuntu-20.04)	7m 11s
build ucm (macOS-13)	9m 17s
build ucm (windows-2019)	11m 52s
generate jit source	9s
run interpreter tests (ubuntu-20.04)	57s
run transcripts (ubuntu-20.04)	4m 14s
run interpreter tests (macos-13)	1m 49s
run transcripts (macos-13)	7m 21s
run transcripts (windows-2019)	7m 24s
build jit binary / build jit binary (ubuntu-20.04)	10s
build jit binary / build jit binary (macOS-13)	16s
build jit binary / build jit binary (windows-2019)	18s
test jit / test jit (ubuntu-20.04)	8s
test jit / test jit (macOS-13)	13s
	51m 32s

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