fix: ssr comments in head elements that require raw content

[DanMB]

Fixes #10935 - HTML comments being added to <title> is annoying, but adding it to <style> and <script> can down right break the entire site, this fixes it the same way the SSR comments were removed from the <textarea> value

Note: I had an issue with creating the test, if i placed the elements inside the <svelte:head> component the test would not fail, even though the _actual-head.html and _expected-head.html did not match up. I've made the test without <svelte:head> so that it actually fails and succeeds and expected.

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Latest commit: 22cac41

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[trueadm]

Please can you put these in constants.js where all the others are? Plus it doesn't need to be a Set, an array here would be slightly faster than a Set as there are so few elements in it.

[DanMB]

Thanks, I have moved and changed it now. I had just used the same method as the VoidElements set that was above.