🏗 Prevent the use of mixed operators

[rsimha]

Warning mode on master, error mode for PR checks.

Fixes #16002

[rsimha]

/to @jridgewell @gmajoulet

[gmajoulet]

Thanks!!

[danielrozenberg]

We can try doing an automated refactor to fix the existing warnings, but the tool I've been using (grasp) requires some more human oversight than I'm willing to give it at the moment.

After running gulp lint and finding which files have which mixed operators, I tried running (grasp)[http://www.graspjs.com/] using e.g., grasp --context 2 --squery 'logic[op="||"][right.op="&&"]' --replace '{{.left}} || ({{.right}})' --in-place [list of .js files], but different mixed rules have different squery search strings and different replacement rules, and grasp messes with formatting, so really it means going through hundreds of files manually, which we can do later

[rsimha]

The idea of this PR is to gradually have these fixed as people edit files. Meanwhile, I agree that if you are able to do a mass refactor and reliably fix all outstanding issues, it's worth doing.