Extract license_text_coalesce helper #9

Job	Run time
init	4s
build / vendor	6m 33s
build / Build (-pm, x86_64-unknown-linux-gnu)	16m 34s
build / Build (x86_64-pc-windows-msvc)	21m 21s
build / Build (-pm, x86_64-pc-windows-msvc)	22m 26s
build / Build (-pm, x86_64-apple-darwin)	14m 47s
build / Build (aarch64-unknown-linux-gnu)	6m 32s
build / Build (aarch64-apple-darwin)	10m 42s
build / Build (x86_64-apple-darwin)	13m 36s
build / Build (-pm, aarch64-apple-darwin)	12m 31s
build / Build (-pm, aarch64-unknown-linux-gnu)	13m 6s
build / Build (x86_64-unknown-linux-gnu)	16m 22s
publish	9m 48s
deploy	0s
	2h 44m 22s

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