Verify x/accounts v2 gRPC service registration

[julienrbrt]

As discussed in the team call, we should verify why this PR: #22673 fixed it.
In theory RegisterServices on runtime/v2 should have registered all the necessary methods.

[mmsqe]

just wonder if this issue is related this todo? since I get Not Implemented error when query like http://localhost:1317/cosmos/authz/v1beta1/grants?

[julienrbrt]

just wonder if this issue is related this todo? since I get Not Implemented error when query like http://localhost:1317/cosmos/authz/v1beta1/grants?

#20798 is related to that todo. That one of our release blocker: https://github.com/orgs/cosmos/projects/26/views/38