[clang] Remove the deprecated flag `-frelaxed-template-template-args`. (#111894) This flag has been deprecated since Clang 19, having been the default since then. It has remained because its negation was still useful to work around backwards compatibility breaking changes from P0522. However, in Clang 20 we have landed various changes which implemented P3310R2 and beyond, which solve almost all of the expected issues, the known remaining few being a bit obscure. So this change removes the flag completely and all of its implementation and support code. Hopefully any remaining users can just stop using the flag. If there are still important issues remaining, this removal will also shake the tree and help us know.
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