Removed GetCollision API it's redundant

[ahcorde]

Signed-off-by: ahcorde [email protected]

🎉 New feature

Summary

Removed GetCollision. FYI @scpeters and @mjcarroll

Checklist

• Signed all commits for DCO
• Added tests
• Added example and/or tutorial
• Updated documentation (as needed)
• Updated migration guide (as needed)
• Consider updating Python bindings (if the library has them)
• 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

Note to maintainers: Remember to use Squash-Merge and edit the commit message to match the pull request summary while retaining Signed-off-by messages.

[codecov]

Codecov Report

Merging #444 (5d06005) into gz-physics6 (1836a0b) will increase coverage by 0.36%.
The diff coverage is n/a.

@@               Coverage Diff               @@
##           gz-physics6     #444      +/-   ##
===============================================
+ Coverage        75.36%   75.73%   +0.36%     
===============================================
  Files              140      140              
  Lines             7068     7034      -34     
===============================================
  Hits              5327     5327              
+ Misses            1741     1707      -34     

Impacted Files	Coverage Δ
bullet-featherstone/src/SDFFeatures.cc	71.85% <ø> (+0.90%)	⬆️
bullet/src/SDFFeatures.cc	52.78% <ø> (+1.75%)	⬆️
dartsim/src/SDFFeatures.cc	62.55% <ø> (+1.08%)	⬆️
sdf/include/gz/physics/sdf/ConstructCollision.hh	100.00% <ø> (ø)
tpe/plugin/src/SDFFeatures.cc	84.66% <ø> (+5.80%)	⬆️

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