Remove debugging code (#5829)

# Motivation

Some code that mocks `createAgent` was added in
#5785 but was not meant to be
merged.

# Changes

Remove the unintended code.

# Tests

Still passes

# Todos

- [ ] Add entry to changelog (if necessary).
not necessary

frontend/src/tests/lib/components/proposal-detail/VotingCard/SnsVotingCard.spec.ts

@@ -1,4 +1,3 @@
-import * as agentApi from "$lib/api/agent.api";
 import * as api from "$lib/api/sns-governance.api";
 import * as snsGovernanceApi from "$lib/api/sns-governance.api";
 import SnsVotingCard from "$lib/components/sns-proposals/SnsVotingCard.svelte";
@@ -111,11 +110,6 @@ describe("SnsVotingCard", () => {
     snsNeuronsStore.reset();
     resetIdentity();
 
-    vi.spyOn(agentApi, "createAgent").mockImplementation(() => {
-      console.log('dskloetx "createAgent"', new Error().stack);
-      throw new Error();
-    });
-
     spyRegisterVote = vi
       .spyOn(snsGovernanceApi, "registerVote")
       .mockResolvedValue();