Update Select Entities GUI plugin to use Entity type

[iche033]

Signed-off-by: Ian Chen [email protected]

🦟 Bug fix

similar to #1144, this PR replaces use of unsigned int / int with Entity for entity ids.

Summary

Checklist

• Signed all commits for DCO
• Added tests
• Updated documentation (as needed)
• Updated migration guide (as needed)
• codecheck passed (See contributing)
• All tests passed (See test coverage)
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[codecov]

Codecov Report

Merging #1146 (45493fa) into ign-gazebo6 (40e5f25) will decrease coverage by 0.02%.
The diff coverage is 0.00%.

@@               Coverage Diff               @@
##           ign-gazebo6    #1146      +/-   ##
===============================================
- Coverage        63.73%   63.70%   -0.03%     
===============================================
  Files              256      256              
  Lines            20116    20116              
===============================================
- Hits             12820    12814       -6     
- Misses            7296     7302       +6     

Impacted Files	Coverage Δ
src/gui/plugins/select_entities/SelectEntities.cc	10.04% <0.00%> (ø)
src/rendering/SceneManager.cc	28.55% <ø> (ø)
src/SimulationRunner.cc	92.91% <0.00%> (-1.02%)	⬇️

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