Update ThreadSafeBox Tests (backport #459)

[mergify]

Changes

• Following up from Expand RealtimeBoxBestEffort #454 (review), this PR improves test coverage by parameterizing the types in realtime_thread_safe_box_tests (similar test is in humble)

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This is an automatic backport of pull request #459 done by [Mergify](https://mergify.com).

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 84.68%. Comparing base (f78ac84) to head (b20b502).

Additional details and impacted files

@@            Coverage Diff             @@
##            jazzy     #467      +/-   ##
==========================================
+ Coverage   84.67%   84.68%   +0.01%     
==========================================
  Files          19       19              
  Lines        1507     1508       +1     
  Branches      146      146              
==========================================
+ Hits         1276     1277       +1     
  Misses        134      134              
  Partials       97       97              

Flag	Coverage Δ
unittests	84.68% <100.00%> (+0.01%)	⬆️

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Files with missing lines	Coverage Δ
realtime_tools/test/realtime_box_tests.cpp	98.82% <100.00%> (+0.01%)	⬆️

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