Remove deprecated for trackRequests, testConfig and baseConfig

[cah-brian-gantzler]

Removed the trackRequest option. Updated docs to show how to use with MirageJS.
Removed the testConfig option for startMirage. Never documented.
Removed some references to baseConfig that should have been removed when makeServer was made the only way to create the server.

[cah-brian-gantzler]

Prettier got me again. I dont think I changed that line, but I did change the file :( Will wait til all the tests are done in case there is something more and then will update

[kevinansfield]

Does testConfig need to be removed? We use it quite a bit as it allows us to mock only the in-development API endpoints for new features whilst developing without having to opt-in to the whole of the system being mocked.

I thought that was documented at some point, or at least included in the default generated config file 🤔 Looking back to 2015 when we first added ember-cli-mirage the following was at the bottom of our config:

/*
 You can optionally export a config that is only loaded during tests
 export function testConfig() {

 }
 */

[cah-brian-gantzler]

Kevin,

Please see issue #2377

I created it to answer your question. Figured more people would find the answer in issues rather than in PR comments.