Use .only and .skip over f and x (no-test-prefixes)

Jest allows you to choose how you want to define focused and skipped tests, with multiple permutations for each:

• only & skip: it.only, test.only, describe.only, it.skip, test.skip, describe.skip.
• 'f' & 'x': fit, fdescribe, xit, xtest, xdescribe.

This rule enforces usages from the only & skip list.

Rule details

This rule triggers a warning if you use one of the keywords from the 'f' & 'x' list to focus/skip a test.

```js /eslint jest/no-test-prefixes: "error"/

it.only('foo'); // valid test.only('foo'); // valid describe.only('foo'); // valid it.skip('foo'); // valid test.skip('foo'); // valid describe.skip('foo'); // valid

fit('foo'); // invalid fdescribe('foo'); // invalid xit('foo'); // invalid xtest('foo'); // invalid xdescribe('foo'); // invalid ```