Please let us skip backend tests for this

I am really frustrated that `backendCodeCoverage` is running

https://github.com/cypress-io/code-coverage/blob/master/support.js#L158-L208

and its failing my test with the error

```
CypressError: `cy.request()` failed trying to load:

http://localhost:34212/__coverage__

We attempted to make an http request to this URL but the request failed without a response.

We received this error at the network level:

> Error: socket hang up

-----------------------------------------------------------

The request we sent was:

Method: GET
URL: http://localhost:34212/__coverage__

-----------------------------------------------------------

Common situations why this would fail:
- you don't have internet access
- you forgot to run / boot your web server
- your web server isn't accessible
- you have weird network configuration settings on your computer

Because this error occurred during a `after all` hook we are skipping all of the remaining tests.
at https://tim-dev-at-intuit-e2e.app.intuit.com/__cypress/runner/cypress_runner.js:157368:78
From previous event:
at Context.request (https://tim-dev-at-intuit-e2e.app.intuit.com/__cypress/runner/cypress_runner.js:157365:15)
From Your Spec Code:
at Context.collectBackendCoverage (https://tim-dev-at-intuit-e2e.app.intuit.com/__cypress/tests?p=cypress/support/index.js:410:10)

From Node.js Internals:
RequestError: Error: socket hang up
at new RequestError (/Users//Library/Caches/Cypress/8.7.0/Cypress.app/Contents/Resources/app/packages/server/node_modules/request-promise-core/lib/errors.js:14:15)
at Request.plumbing.callback (/Users//Library/Caches/Cypress/8.7.0/Cypress.app/Contents/Resources/app/packages/server/node_modules/request-promise-core/lib/plumbing.js:87:29)
at Request.RP$callback [as _callback] (/Users//Library/Caches/Cypress/8.7.0/Cypress.app/Contents/Resources/app/packages/server/node_modules/request-promise-core/lib/plumbing.js:46:31)
at self.callback (/Users//Library/Caches/Cypress/8.7.0/Cypress.app/Contents/Resources/app/packages/server/node_modules/@cypress/request/request.js:183:22)
at Request.emit (events.js:376:20)
at Request.onRequestError (/Users//Library/Caches/Cypress/8.7.0/Cypress.app/Contents/Resources/app/packages/server/node_modules/@cypress/request/request.js:869:8)
at ClientRequest.emit (events.js:388:22)
at Socket.socketOnEnd (_http_client.js:499:9)
at Socket.emit (events.js:388:22)
at endReadableNT (internal/streams/readable.js:1336:12)
at processTicksAndRejections (internal/process/task_queues.js:82:21)
```

**Describe the solution you'd like**
A clear and concise description of what you want to happen.

let me skip this part because i am not trying to collect backend test coverage but by your check that `baseUrl` and `proxyUrl` this part of your code thinks i am...

**Describe alternatives you've considered**
A clear and concise description of any alternative solutions or features you've considered.
so far i have just edited the file directly and turned off those lines by just hard coding a false. right now i am looking at ways to set proxyUrl but there doesnt seem to be an easy way to do that.
**Additional context**
Add any other context or screenshots about the feature request here.