[Backport Citadel] Increase TransformControl test converage (#668)

[ahcorde]

Signed-off-by: ahcorde ahcorde@gmail.com

🎉 New feature

Summary

Related with gazebosim/gz-sim#1575

Backport https://github.com/gazebosim/gz-rendering/pull/668/files

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 #741 (713c616) into ign-rendering3 (c542cc8) will increase coverage by 1.34%.
The diff coverage is n/a.

@@                Coverage Diff                 @@
##           ign-rendering3     #741      +/-   ##
==================================================
+ Coverage           77.66%   79.01%   +1.34%     
==================================================
  Files                 100      100              
  Lines                7805     7805              
==================================================
+ Hits                 6062     6167     +105     
+ Misses               1743     1638     -105     

Impacted Files	Coverage Δ
include/ignition/rendering/base/BaseGizmoVisual.hh	88.02% <0.00%> (+0.49%)	⬆️
src/TransformController.cc	90.18% <0.00%> (+31.59%)	⬆️

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