build: migrate license file handling to `write_source_file` #2293

Job	Run time
lint	2m 24s
build	24s
build-e2e-windows	20s
e2e-windows	0s
publish-snapshots	0s
Browser Compatibility Tests	0s
e2e-package-managers	0s
test	0s
e2e	0s
e2e-snapshots	0s
	3m 8s

Provide feedback