Make circular motion in example more compatible

[urfeex]

This motion should work on

• UR5
• UR5e
• UR20

These are all the models we currently use during tests.

Another approach would be to use relative target positions, but I would like to leave that for a later iteration.

---

Note

Low Risk
Low risk: changes are limited to an example program’s hardcoded motion waypoints and should not affect library behavior. Main risk is the updated demo trajectory still failing or behaving unexpectedly on some robot configurations.

Overview
Adjusts the examples/instruction_executor.cpp motion demo to make the showcased circular move (moveC) more broadly executable across UR5/UR5e/UR20.

Specifically replaces the previous moveC via/target waypoints with a preceding moveP and new via/target pose + joint targets intended to be more compatible.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 77.31%. Comparing base (3f95311) to head (ee4bd1a).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #508      +/-   ##
==========================================
+ Coverage   76.96%   77.31%   +0.35%     
==========================================
  Files         116      116              
  Lines        6343     6353      +10     
  Branches     2761     2764       +3     
==========================================
+ Hits         4882     4912      +30     
+ Misses       1113     1087      -26     
- Partials      348      354       +6     

Flag	Coverage Δ
check_version_ur10-3.15.8	11.98% <ø> (?)
check_version_ur10e-10.11.0	11.73% <ø> (?)
check_version_ur10e-5.15.2	12.17% <ø> (?)
check_version_ur12e-10.12.1	11.73% <ø> (?)
check_version_ur12e-5.25.1	11.93% <ø> (?)
check_version_ur15-10.12.1	11.73% <ø> (?)
check_version_ur15-5.25.1	11.78% <ø> (?)
check_version_ur16e-10.12.1	11.73% <ø> (?)
check_version_ur16e-5.25.1	11.73% <ø> (?)
check_version_ur18-10.12.1	11.73% <ø> (?)
check_version_ur18-5.25.1	11.73% <ø> (?)
check_version_ur20-10.12.1	11.73% <ø> (?)
check_version_ur20-5.25.1	11.93% <ø> (?)
check_version_ur3-3.14.3	11.78% <ø> (?)
check_version_ur30-10.12.1	11.83% <ø> (?)
check_version_ur30-5.25.1	11.73% <ø> (?)
check_version_ur3e-10.11.0	11.73% <ø> (?)
check_version_ur3e-5.9.4	12.17% <ø> (?)
check_version_ur5-3.15.8	13.22% <ø> (?)
check_version_ur5e-10.11.0	11.73% <ø> (?)
check_version_ur5e-5.12.8	11.93% <ø> (?)
check_version_ur7e-10.11.0	11.73% <ø> (?)
check_version_ur7e-5.22.2	11.78% <ø> (?)
check_version_ur8long-10.12.1	11.78% <ø> (?)
check_version_ur8long-5.25.1	11.73% <ø> (?)
python_scripts	75.90% <ø> (ø)
start_ursim	83.51% <ø> (-1.58%)	⬇️
ur20-latest	72.76% <ø> (-0.40%)	⬇️
ur5-3.14.3	72.53% <ø> (?)
ur5e-10.11.0	66.80% <ø> (-0.52%)	⬇️
ur5e-10.12.0	67.83% <ø> (-0.49%)	⬇️
ur5e-10.7.0	66.34% <ø> (-0.32%)	⬇️
ur5e-5.9.4	73.35% <ø> (-0.35%)	⬇️

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