fix: flaky test ` onboarding @no-mmi doesn't make any network request…

…s to infura before onboarding is completed/test-failure-screenshot-1.png` timeout (#25525)

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## **Description**

This test appears flaky as sometimes not all the requests are made when
we finish the onboarding. Notice how, we mock 5 requests, but in the
logs, only 4 appear after the onboarding. Specifically the `net_version`
request doesn't happen in this case.

[EDIT] It seems that the explanation for this is what @HowardBraham
mentions below: since we mock the balance as non-zero, the wallet keeps
querying the balance for the subsequent accounts. This could be that
causes the wallet to enter in a non-finishing loop, and the
`net_version` request is also never triggered (see this should happen
after the `eth_call`)


![image](https://github.com/MetaMask/metamask-extension/assets/54408225/291d94f5-e0aa-4ff9-b96b-46c8bcdd7cc8)


[![Open in GitHub
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## **Related issues**

Fixes: #25543

## **Manual testing steps**

1. Check ci

## **Screenshots/Recordings**

<!-- If applicable, add screenshots and/or recordings to visualize the
before and after of your change. -->

![Screenshot from 2024-06-26
15-05-52](https://github.com/MetaMask/metamask-extension/assets/54408225/93a9d29c-10ca-479d-9e67-e76c46c23fb8)


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## **Pre-merge reviewer checklist**

- [ ] I've manually tested the PR (e.g. pull and build branch, run the
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test/e2e/tests/onboarding/onboarding.spec.js

@@ -372,7 +372,7 @@ describe('MetaMask onboarding @no-mmi', function () {
               json: {
                 jsonrpc: '2.0',
                 id: '1111111111111111',
-                result: '0x1',
+                result: '0x0',
               },
             };
           }),
@@ -508,7 +508,7 @@ describe('MetaMask onboarding @no-mmi', function () {
               json: {
                 jsonrpc: '2.0',
                 id: '1111111111111111',
-                result: '0x1',
+                result: '0x0',
               },
             };
           }),