Disable cmdline tests on homebrew

[Blast545]

Summary

Disables cmdline tests that haven't passed on ign-launch2 job for homebrew, reference: https://build.osrfoundation.org/job/gz_launch-ci-ign-launch2-homebrew-amd64/46/

I think that just adding the disable macro for the tests should be enough, but I'm following the same pattern used in https://github.com/gazebosim/gz-launch/pull/255 for consistency.

cc: @Crola1702

Checklist

• [x] Signed all commits for DCO
• [x] Added (disables) tests
• [ ] Updated documentation (as needed)
• [ ] Updated migration guide (as needed)
• [ ] Consider updating Python bindings (if the library has them)
• [ ] codecheck passed (See contributing)
• [ ] All tests passed (See test coverage)
• [ ] While waiting for a review on your PR, please help review another open pull request to support the maintainers

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