xds: use a standalone Context for xDS control plane RPCs (manual v1.37.x backport) #8161
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Control plane RPCs are independent of application RPCs, they can stand for completely different lifetime. So the context for making application RPCs should not be propagated to control plane RPCs.
Manual backport of #8153. Mostly same as #8153, with added change for server side instantiation of ClientXdsClient. Done manually due to large amount of conflicts caused by other changes made to ClientXdsClient instantiations.