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

[Juliaj]

Purpose

• Add the missing change for openset_launch.py from https://github.com/RobotecAI/rai/pull/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[bot]]

Codecov Report

:white_check_mark: All modified and coverable lines are covered by tests. :white_check_mark: Project coverage is 65.32%. Comparing base (3b989bf) to head (3b45531). :warning: Report is 1 commits behind head on main. :white_check_mark: 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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