net/http: use slices to simplify the code

[apocelipes]

"strSliceContains" is replaced by "slices.Contains".

Replace "sort.Strings" with "slices.Sort" since it becomes a wrapper
of "slices.Sort" from Go 1.22.

"headerSorter" no longer has to implement "sort.Interface".
We use "slice.SortFunc" to sort kvs.

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