[clang] [clang] Enable C++17 relaxed template template argument matching by default (PR #89807)

[Matheus Izvekov via cfe-commits]

mizvekov wrote:

> @mizvekov We have a bunch of related issues, could you look at them https://github.com/llvm/llvm-project/issues?q=is%3Aissue+is%3Aopen+%22-frelaxed-template-template-args%22 ?

Removed a bunch of duplicates. 4 issues remaining:

1) #36505 Is the issue we are fixing in this patch.
2) #65843 Is unrelated.
3) #63281 Is not a bug
4) #62529 The bug is accepting it, although perhaps we could seek clarification if we should exclude template template parameters from [CWG1430](https://cplusplus.github.io/CWG/issues/1430.html)


https://github.com/llvm/llvm-project/pull/89807