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 85.32%. Comparing base (803e40b) to head (194c5b6).

Additional details and impacted files

@@            Coverage Diff             @@
##           kilted     #468      +/-   ##
==========================================
- Coverage   85.42%   85.32%   -0.11%     
==========================================
  Files          17       17              
  Lines        1448     1451       +3     
  Branches      135      135              
==========================================
+ Hits         1237     1238       +1     
- Misses        122      123       +1     
- Partials       89       90       +1     

Flag	Coverage Δ
unittests	85.32% <100.00%> (-0.11%)	⬇️

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

... and 2 files with indirect coverage changes

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