GHA/macos: enable QUIC API with OpenSSL

GHA/macos: enable QUIC API with OpenSSL

In one autotools and one cmake job.

Also:
- enable OpenSSL QUIC in two more jobs.
- pytest: add checks to skip h3 tests when there is no h3 server to
  tests 26, 27a, 27b, 27c, 29 in test_02_download. Fixing:
  ```
  FAILED tests/http/test_02_download.py::TestDownload::test_02_26_session_shared_reuse[h3] - AssertionError: expected exit code 0, got 1
  [...]
  ```
  Ref: https://github.com/curl/curl/actions/runs/16392680316/job/46320739635?pr=17973

Ref: https://github.com/Homebrew/homebrew-core/pull/230515
Ref: https://github.com/Homebrew/homebrew-core/commit/6c8e3eed129ed362da8b97b94f1a5372b2289e09

Closes #17973