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Add content mapper output extensions #38495

Job	Run time
release-build	12m 4s
build	3m 19s
test (concurrent test programs)	14m 22s
generate	5m 1s
package-feed-proxy	1m 1s
test (windows arm64)	19m 29s
test (race mode)	16m 46s
lint (windows-latest)	13m 54s
test extra (ubuntu-latest)	8m 46s
tidy	1m 1s
smoke	3m 4s
lint (noembed)	8m 2s
test extra (windows-latest)	8m 55s
format	1m 47s
go-test	11m 7s
test (noembed)	8m 9s
test (linux arm64)	10m 15s
codegen	9m 22s
lint (ubuntu-latest)	8m 21s
misc	55s
test (windows-latest)	19m 30s
extension	26s
test (ubuntu-latest)	14m 3s
required	4s
	3h 19m 43s