[cypress] add support for cypress-multi-reporter

[aramissennyeydd]

We're using the https://www.npmjs.com/package/cypress-multi-reporters Cypress plugin, which takes in a config file that lists other reporters.

Example,

// in cypress.config.ts
export default defineConfig({
  reporter: 'cypress-multi-reporters',
  reporterOptions: {
    configFile: 'reporter-config.json',
  },
  // other stuff
})

and in the referenced config file,

{
  "reporterEnabled": "mochawesome, mocha-junit-reporter", // comma + space separated list
}

Which currently reports,

## Unused dependencies (3)

| Name                    | Location     | Severity |
| :---------------------- | :----------- | :------- |
| cypress-multi-reporters | package.json | error    |
| mocha-junit-reporter    | package.json | error    |
| mochawesome             | package.json | error    |

With the following package.json dependencies,

{
"name": "my-e2e-package",
"dependencies": {
    "cypress": "12.17.4",
    "cypress-multi-reporters": "^1.6.3",
    "mocha": "^10.2.0",
    "mocha-junit-reporter": "^2.2.0",
    "mochawesome": "^6.2.2"
  }
}

It would be awesome to see this supported in knip! Happy to submit a PR!

[webpro]

Thanks @aramissennyeydd, a PR for this is welcome. I think it makes sense to add it to the Cypress plugin.