[libcxx][libc] update LLVM-libc test status (#201236)

This update removes some unnecessary carveouts, marks some newly
XFAILing tests, and unmarks some now passing tests.

With this change the status of tests is:
Total Discovered Tests: 11471
  Unsupported      : 2098 (18.29%)
  Passed           : 9260 (80.73%)
  Expectedly Failed:  113 (0.99%)

Assisted-by: Automated tooling, human reviewed.
GitOrigin-RevId: 0cf914adef4b0f1f5251354b91f5c709b95b1b1e