Help: add release notes

Help/release/dev/ctest_test-ignore-skipped-tests.rst

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+ctest_test-ignore-skipped-tests
+-------------------------------
+
+* When running tests, CTest learned to treat skipped tests (using the
+  :prop_test:`SKIP_RETURN_CODE` property) the same as tests with the
+  :prop_test:`DISABLED` property. Due to this change, CTest will not indicate
+  failure when all tests are either skipped or pass.