[Code Health] Ensure gateway module msg responses are non-empty

[bryanchriswhite]

Summary

Ensure all supplier module msg responses are non-empty. This adds an Gateway field to the following protobuf type(s), and updates the unit tests to assert for presence and correctness.

• MsgUnstakeGatewayResponse

Issue

• [On-Chain] Ensure all message responses contain results #663

Type of change

Select one or more from the following:

• New feature, functionality or library
• Consensus breaking; add the consensus-breaking label if so. See [Infra] Automatically add the consensus-breaking label #791 for details
• Bug fix
• Code health or cleanup
• Documentation
• Other (specify)

Testing

• Documentation: make docusaurus_start; only needed if you make doc changes
• Unit Tests: make go_develop_and_test
• LocalNet E2E Tests: make test_e2e
• DevNet E2E Tests: Add the devnet-test-e2e label to the PR.

Sanity Checklist

• I have tested my changes using the available tooling
• I have commented my code
• I have performed a self-review of my own code; both comments & source code
• I create and reference any new tickets, if applicable
• I have left TODOs throughout the codebase, if applicable