Add `google-pubsub-grpc()` destination #1113

Job	Run time
create-source-tarball	2m 51s
create-packages / almalinux-8	4m 5s
create-packages / almalinux-9	7m 25s
create-packages / debian-bookworm	6m 29s
create-packages / debian-testing	6m 30s
create-packages / fedora-41	7m 48s
create-packages / ubuntu-noble	9m 3s
	44m 11s

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