Make className accessible to CatchAddTests.cmake integration

**Description**
In the current state, neither the `--list-tests` nor the `--list-test-names-only` provide access to `TestCaseInfo::className`.

This is in contrast to the standalone reporters which partially do provide fully qualified class names as context information.

As a result, that piece of information is also missing for `CatchAddTests.cmake` and all tests are only available as a flat list.

This used to be a feature with `ParseAndAddCatchTests.cmake` and the `PARSE_CATCH_TESTS_ADD_FIXTURE_IN_TEST_NAME` option.
Since this is no longer based on direct parsing, `--list-tests` would be the best candidate to extend the highest verbosity level by the `className` attribute.

**Additional context**

While this isn't required for `CTest` to select a test, it would be preferable to have the test name stronger qualified for reporting in CI use cases.