[clang] Add tests for DRs about inheriting constructors (#79981) Covers CWG issues [1150](https://cplusplus.github.io/CWG/issues/1150.html), [1487](https://cplusplus.github.io/CWG/issues/1487.html), [1567](https://cplusplus.github.io/CWG/issues/1567.html), [1738](https://cplusplus.github.io/CWG/issues/1738.html), [2273](https://cplusplus.github.io/CWG/issues/2273.html), [2277](https://cplusplus.github.io/CWG/issues/2277.html), [2356](https://cplusplus.github.io/CWG/issues/2356.html), [2504](https://cplusplus.github.io/CWG/issues/2504.html). On top of the wording in proposed resolutions, [P0136R1](https://wg21.link/p0136r1) "Rewording inheriting constructors (core issue 1941 et al)" is a very relevant paper. Note that status for 1738 `sup P0136R1` is not officially recognized by CWG, but saying `yes` or `no` seems even more confusing to me. Official resolution is to reject certain code, but Clang is the only implementation that still rejects it to this day: https://godbolt.org/z/b1W8jc1o5. GCC rejected it until 9, now it's accepted: https://godbolt.org/z/of6oh4sdT
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