`gap` doesn't work with `flex` on Safari #12452

Describe the bug

I've been living thinking that gap (as well as grid-gap) works perfectly fine with flex elements. Today I learned it's not supported in Safari which means there's a missing whitespace in Safari which I have already confirmed testing few views.

That means we have to fix all instances of a combination of two utility classes flex with gap-* in our views (.html.erb, .js, .jsx) AND also all instances of similar situation but in our SCSS files...

Yes, gap does work with grid but we should not simply replace every flex instance with grid because grid is for layout and flex is for components.

So in most cases we will have to remove gap property and replace it with additional margin on child elements...

To Reproduce

Test our site in Safari.

Desktop (please complete the following information):

• Browser: Safari.

Smartphone (please complete the following information):

• Browser: Safari