Switch to min.js convention

[nbachiyski]

Most of the projects I use these days use min.js for the filenames of their minified files. This does a couple of good things:

• Sets some expectations in developers looking at the files. Numerous times I've forgotten for our .dev.js convention and have opened the minified files in a text editor.

• Sets some expectations in some software tools. For example, ack automatically skips searching min.js files.

Possible problems: I don't see any.

Plugins should be using wp_enqueue_script() and changing paths shouldn't be a problem. Browser caches of developers shouldn't be a huge problem, either.

If everybody is fine with the change, I'd be happy to volunteer and steer the transition, including the patches.

[SergeyBiryukov]

#21633