Improved handling of `files` target property #3149

Job	Run time
check-diff / check	17s
serialization / serialization-tests	7m 46s
c / benchmarking / benchmark-tests	6m 42s
c / ccpp / regular-tests (ubuntu-latest)	23m 16s
c / default / regular-tests (ubuntu-latest)	26m 13s
py / py-tests / regular-tests (ubuntu-latest)	16m 32s
c / verifier / run (ubuntu-latest)	5m 33s
rs / rs-benchmark-tests / benchmark-tests	14m 55s
rs / rs-tests / regular-tests (ubuntu-latest, stable)	8m 37s
cpp / cpp-benchmark-tests / benchmark-tests	11m 39s
cpp / cpp-ros2-tests / cpp-ros2-tests	41m 52s
cpp / cpp-tests / regular-tests (ubuntu-latest)	47m 39s
ts / benchmarking / benchmark-tests	3m 35s
ts / ts-tests / regular-tests (ubuntu-latest)	18m 3s
	3h 52m 39s

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