Stop a python source once the subscriber is no longer subscribed

[dagardner-nv]

Description

• When a Python generator source yields a value, and the subscriber is no longer subscribed, stop the source.
• Fix out of date docstring comment.

This is a partial fix for nv-morpheus/Morpheus#1838

Checklist

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

[dagardner-nv]

/merge

[dagardner-nv]

/merge

[codecov]

Codecov Report

Attention: Patch coverage is 50.00000% with 1 line in your changes missing coverage. Please review.

Project coverage is 74.05%. Comparing base (bceb7ef) to head (9d61aa3).
Report is 1 commits behind head on branch-24.10.

Files with missing lines	Patch %	Lines
python/mrc/_pymrc/src/segment.cpp	50.00%	1 Missing ⚠️

Additional details and impacted files

@@               Coverage Diff                @@
##           branch-24.10     #493      +/-   ##
================================================
- Coverage         74.07%   74.05%   -0.03%     
================================================
  Files               403      403              
  Lines             14401    14403       +2     
  Branches           1132     1132              
================================================
- Hits              10668    10666       -2     
- Misses             3733     3737       +4     

Flag	Coverage Δ
cpp	70.81% <0.00%> (-0.04%)	⬇️
py	41.81% <100.00%> (+0.01%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
cpp/mrc/src/internal/service.hpp	0.00% <ø> (ø)
python/mrc/_pymrc/src/segment.cpp	81.69% <50.00%> (-0.42%)	⬇️

... and 4 files with indirect coverage changes

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