Invoke Python's gc prior to finalizing a thread

[dagardner-nv]

Description

• Call gc.collect prior to finalizing a thread. Works-around an issue where finalizing the thread can in some cases can cause thread-local storage to be freed prior to some objects being de-allocated which might in turn invoke gc.collect
• Includes changes from PR Draft: Revert partially constructed segments on-error in segment init function #361

fixes #362

Checklist

• I am familiar with the Contributing Guidelines.
• New or existing tests cover these changes.
• The documentation is up to date with these changes.

[codecov]

Codecov Report

Merging #363 (50abe96) into branch-23.11 (9b47924) will increase coverage by 0.00%.
The diff coverage is 100.00%.

Additional details and impacted files

@@              Coverage Diff              @@
##           branch-23.11     #363   +/-   ##
=============================================
  Coverage         73.11%   73.12%           
=============================================
  Files               382      382           
  Lines             13403    13408    +5     
  Branches           1010     1010           
=============================================
+ Hits               9800     9804    +4     
- Misses             3603     3604    +1     

Flag	Coverage Δ
cpp	69.06% <100.00%> (+0.01%)	⬆️
py	42.07% <100.00%> (+0.01%)	⬆️

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Files Changed	Coverage Δ
...pp/mrc/src/internal/segment/builder_definition.cpp	83.53% <100.00%> (+0.30%)	⬆️
python/mrc/_pymrc/src/executor.cpp	54.46% <100.00%> (-0.09%)	⬇️

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