ur_configuration_controller: use try_set on RTBox

[urfeex]

Using set could potentially block the RT thread.

Also, realtime_tools have changed their API regarding the set function not to accept a call by value to a pointer anymore, so we have to touch this anyway.

[codecov]

Codecov Report

❌ Patch coverage is 0% with 11 lines in your changes missing coverage. Please review.
✅ Project coverage is 5.10%. Comparing base (1b121b7) to head (7eb8281).
⚠️ Report is 476 commits behind head on main.

Files with missing lines	Patch %	Lines
ur_controllers/src/ur_configuration_controller.cpp	0.00%	11 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff            @@
##            main   #1470      +/-   ##
========================================
+ Coverage   3.59%   5.10%   +1.51%     
========================================
  Files         13      33      +20     
  Lines        947    3408    +2461     
  Branches     152     429     +277     
========================================
+ Hits          34     174     +140     
- Misses       843    3232    +2389     
+ Partials      70       2      -68     

Flag	Coverage Δ
unittests	5.10% <0.00%> (+1.51%)	⬆️

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