Preserve webpack/vite ignore comments when minifying #19922
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They were removed in the minified build, but the code that made the comments necessary was still there (just minified). This commit updates the Terser config to preserve them. The default value of Terser's `comments` option is [`/@preserve|@copyright|@lic|@cc_on|^\**!/i`](https://github.com/terser/terser/blob/d528103b7c00735ca7736a2a8ad27188e93c0c90/lib/output.js#L178C12-L178C53), however the only type of comment it was actually matching in our case is `@lic`, for the license header in minified files. Thus the new regexp is `/@lic|webpackIgnore|@vite-ignore/i`.
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Found this while investigating #19921.