Preserve \src attributes through ABC9 synthesis #7

Job	Run time
pre_job	4s
pre_docs_job	5s
Reusable build (macos-latest)	1s
Reusable build (ubuntu-latest)	14m 53s
Try build docs	-1s
Run tests	1s
Run test_cell	1s
Run docs tests	1s
	15m 5s

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