fix: the path to launch run_perception_agents plus a few test fixes

[Juliaj]

Purpose

• Add the missing change for openset_launch.py from chore: rai-perception - update docs to use pip install and add more tests #719 because we moved the scripts folder within rai_perception.
• Make tracing unit tests more robust and fix some deprecation warnings from other tests.

Proposed Changes

• Update openset_launch.py to use the new path.
• Updated test mocks to make unit tests run more smoothly.

Testing

• Add new test for openset_launch.py to catch the missed change.
• Unit tests ran and passed.
• manipluation demo ran with "swap any two cubes", result returned.
• rosbot-XL demo ran with "what do you see", result returned.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 65.32%. Comparing base (7626288) to head (7a10984).
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #722   +/-   ##
=======================================
  Coverage   65.32%   65.32%           
=======================================
  Files          78       78           
  Lines        3386     3386           
=======================================
  Hits         2212     2212           
  Misses       1174     1174           

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