Fix normalization of .rsc extension (#46043)
Fixes #45883
Fixes NEXT-541
The reason the url after normalization in middleware ended up being
`/somethingabc=def` instead of `/something?abc=def` is that the regex
matches `?` so the `?` will be removed. Since it's in a capture group
the only change needed was applying that by adding `$1` to the
replacement.
Added some unit tests for this function, going to add additional
integration tests now.
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## Bug
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