Enable specific entities on buoyancy plugin

[chapulina]

🦟 Bug fix

This is technically a feature, but it fixes a usability bug that affects the Fortress demo.

Summary

Adds the ability of whitelisting just a few models in simulation which will be affected by buoyancy.

Also reduced console spam by printing a warning only once.

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)
• While waiting for a review on your PR, please help review another open pull request to support the maintainers

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[arjo129]

Tested this. It seems to work for me. There are some style fixes required before merging though.

[codecov]

Codecov Report

Merging #1067 (43d8e86) into main (a452a01) will increase coverage by 0.00%.
The diff coverage is 80.00%.

❗ Current head 43d8e86 differs from pull request most recent head 5b9bc46. Consider uploading reports for the commit 5b9bc46 to get more accurate results

@@           Coverage Diff           @@
##             main    #1067   +/-   ##
=======================================
  Coverage   64.06%   64.06%           
=======================================
  Files         255      255           
  Lines       19963    19986   +23     
=======================================
+ Hits        12790    12805   +15     
- Misses       7173     7181    +8     

Impacted Files	Coverage Δ
src/systems/buoyancy/Buoyancy.hh	100.00% <ø> (ø)
src/systems/buoyancy/Buoyancy.cc	83.01% <80.00%> (+0.47%)	⬆️
src/SimulationRunner.cc	92.91% <0.00%> (-1.02%)	⬇️
src/Util.cc	93.53% <0.00%> (+0.43%)	⬆️

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[chapulina]

I've addressed all comments, merging!