Add support for UR8 LONG

[urfeex]

Add support for the recently released UR8 Long.

• Add it as a model to start_ursim.sh
• Add it to `URCL::RobotType

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 77.48%. Comparing base (f7efbfa) to head (9d79e9b).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #375      +/-   ##
==========================================
- Coverage   77.98%   77.48%   -0.51%     
==========================================
  Files          92       92              
  Lines        4161     4161              
  Branches      461      461              
==========================================
- Hits         3245     3224      -21     
- Misses        680      698      +18     
- Partials      236      239       +3     

Flag	Coverage Δ
start_ursim	80.89% <100.00%> (-3.32%)	⬇️
ur20-latest	75.60% <ø> (-0.24%)	⬇️
ur5-3.14.3	76.10% <ø> (-0.13%)	⬇️
ur5e-10.7.0	70.80% <ø> (-0.06%)	⬇️
ur5e-5.9.4	76.01% <ø> (-0.06%)	⬇️

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