More precise blank lines in transcript UCM blocks #95

Job	Run time
ormolu	6s
build ucm (ubuntu-20.04)	26m 34s
build ucm (macOS-13)	41m 39s
build ucm (windows-2019)	34m 27s
run interpreter tests (ubuntu-20.04)	1m 2s
generate jit source	5m 47s
run transcripts (ubuntu-20.04)	3m 56s
run interpreter tests (macos-13)	2m 36s
run transcripts (macos-13)	8m 16s
run transcripts (windows-2019)	7m 47s
build jit binary / build jit binary (ubuntu-20.04)	1m 18s
build jit binary / build jit binary (macOS-13)	7m 16s
build jit binary / build jit binary (windows-2019)	4m 38s
test jit / test jit (ubuntu-20.04)	1m 44s
test jit / test jit (macOS-13)	2m 54s
	2h 30m 0s

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