Add support for launching UR8Long

[urfeex]

This requires UniversalRobots/Universal_Robots_ROS2_Description#319

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 5.37%. Comparing base (1b121b7) to head (7e51e8e).
⚠️ Report is 481 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff            @@
##            main   #1490      +/-   ##
========================================
+ Coverage   3.59%   5.37%   +1.78%     
========================================
  Files         13      33      +20     
  Lines        947    3239    +2292     
  Branches     152     391     +239     
========================================
+ Hits          34     174     +140     
- Misses       843    3063    +2220     
+ Partials      70       2      -68     

Flag	Coverage Δ
unittests	5.37% <ø> (+1.78%)	⬆️

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