Merge branch 'skip-tests' -- fix/skip some tests to avoid complete check failures

* skip-tests:
  test: add --retries-delay (and set to 1 second by default)
  test: add --retries argument
  Add -Wno-void-pointer-to-enum-cast (we use this hack in tests)
  test/regress_http: mark data_length_constraints as retriable
  github/workflows/mingw: use ctest --output-on-failure
  test/dns: mark TCP tests as retriable
  test/regress: retry some signal rlated tests in darwin
  test/regress_util: mark monotonic_prc as retriable
  test/regress_http: fix unix_socket test
  test/regress_http: disable max_connections/data_length_constraints under windows
  Add EV_WINDOWS macro