Added gRPC support to the App Engine Images service for image transfo… #1970

Job	Run time
build (ubuntu-latest, 25, temurin)	19m 18s
build (ubuntu-latest, 17, temurin)	21m 10s
build (ubuntu-latest, 21, temurin)	22m 29s
build (ubuntu-latest, 27-ea, temurin)	19m 54s
	1h 22m 51s

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