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fix: avoid repeated root scans in no-op builds #38975

Job	Run time
go-test	11m 25s
generate	5m 5s
extension	18s
release-build	13m 0s
build	3m 6s
test (windows arm64)	17m 53s
test extra (windows-latest)	12m 1s
tidy	1m 32s
misc	59s
codegen	10m 7s
smoke	3m 55s
package-feed-proxy	59s
test (windows-latest)	19m 46s
test (ubuntu-latest)	15m 9s
lint (noembed)	9m 8s
lint (windows-latest)	12m 54s
test extra (ubuntu-latest)	10m 7s
format	52s
test (linux arm64)	9m 20s
test (race mode)	20m 27s
test (concurrent test programs)	14m 26s
lint (ubuntu-latest)	6m 55s
test (noembed)	8m 58s
required	6s
	3h 28m 28s