feat(rules): adds no-if rule

[cartogram]

If statements in tests is usually a bad idea. This PR prevents them.

Examples of incorrect code for this rule:

it('foo', () => {
 if ('bar') {
   // an if statement here is invalid
   // you are probably testing too much
 }
});

it('foo', () => {
 const bar = foo ? 'bar' : null;
});

Examples of correct code for this rule:

it('foo', () => {
 // only test the 'foo' case
});

it('bar', () => {
 // test the 'bar' case separately
});

it('foo', () => {
 function foo(bar) {
   // nested functions are valid
   return foo ? bar : null;
 }
});

[SimenB]

Thanks! Left a nit, but this looks like a good rule to me 🙂

[SimenB]

🎉 This PR is included in version 22.10.0 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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