ci: install the ros extra so test_ros.py actually runs

[petercorke]

Summary

Fixes the CI half of #80: rosbags, roslibpy and websockets (the ros extra) were never installed in CI, so tests/test_ros.py was largely skipped — including TestRosBagRos1/2, TestRosTopicLive and the three open3d-gated test_publish_pointcloud_* tests.

Adds an Install ros extra step on the same Ubuntu / OpenCV 5 legs that already install open3d (all Python versions).

Verified locally

Clean isolated venv (Python 3.12, OpenCV 5.0, open3d 0.20, .[dev,tool,ros]):

• tests/test_ros.py: 63 passed, 3 skipped without open3d; the 3 pointcloud-publish tests pass with it.
• Full suite: 999 passed, 37 skipped (CI was 942 passed, 94 skipped).

Notes

• roslibpy pulls in Twisted/Autobahn, so a Python 3.13/3.14 leg could in principle fail to install it; CI on this PR will show that.
• Closes only the CI part of roslibpy (ros extra) never installed in CI, so TestRosTopicValidation is entirely skipped #80; leaving the issue open until this is merged and green.

Checklist

• PR title follows Conventional Commits
• Tests pass locally
• CI green on all legs

🤖 Generated with Claude Code

[codacy-production]

Up to standards ✅

🟢 Issues 0 issues

Results:
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