feat(pubsub): support x-goog-user-project #8456
Merged
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Change the metadata decorators to inject
x-goog-user-projectfrom thecurrent option span.
For the admin APIs, use the per-call options to configure a span in the
*Clientclass. Forpubsub::Publisherandpubsub::Subscriberit isless clear which call "triggers" an RPC, and far less clear how to merge
options from multiple RPCs. I have decided to use the per-connection
options in this case. We can always add more fine-grained options later,
but this takes care of the common case.
Part of the work for #8284 and will help with #3317
This change is