New rule: No template strings without variables in them

[andsens]

Example of allowed template string:

const x = 'world';
const message = `Hello ${x}`;

Example of disallowed template string:

const x = 'world';
const message = `Hello world`;

[andsens]

There could be some linebreak funkiness where backticks would be needed even though no variables are used, that should then be an exception to that rule.

[thetrompf]

I believe there exist such rule already.

[andsens]

As @thetrompf and I found out, there does not.