Adds maliput_sparse and maliput_osm dependencies to the maliput.repos file and CI builds.

[francocipollone]

🎉 New feature

Related to https://github.com/maliput/maliput_osm/issues/22 and https://github.com/maliput/maliput_sparse/issues/25

Summary

Adds maliput_sparse and maliput_osm dependencies to the maliput.repos file and CI builds.

Checklist

• [x] Signed all commits for DCO
• [ ] Added tests
• [ ] Added example and/or tutorial
• [ ] Updated documentation (as needed)
• [ ] Updated migration guide (as needed)
• [ ] Consider updating Python bindings (if it affects the public API)

Note to maintainers: Remember to use Squash-Merge and edit the commit message to match the pull request summary while retaining Signed-off-by messages.