Support multiple reporters for `catch_discover_tests`

**Description**
When running Catch2 tests from the command line, it's possible to specify and configure multiple reporters, e.g. console with colors and JUnit, to make it easy to for a human to use console output and easy for a CI/CD system to digest JUnit results. However, when using the `catch_discover_tests` CMake utility, only one reporter can be provided. Is it possible it could be extended to support multiple reporters, or have some other way to get both colorful console output and JUnit output?