Added Sample Doc Action Task and Cleanup Task Execution

[JSv4]

Added sample contract classifier using gpt4 plus some cleanup in how we kickoff and handle analyses.

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 85.50725% with 10 lines in your changes missing coverage. Please review.

Project coverage is 78.40%. Comparing base (dc36b9b) to head (9bf3f3f). Report is 10 commits behind head on main.

Files	Patch %	Lines
opencontractserver/tasks/analyzer_tasks.py	50.00%	3 Missing :warning:
opencontractserver/tasks/doc_analysis_tasks.py	66.66%	3 Missing :warning:
opencontractserver/tasks/corpus_tasks.py	90.47%	2 Missing :warning:
opencontractserver/utils/celery_tasks.py	86.66%	2 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #198 +/- ## ========================================== - Coverage 78.43% 78.40% -0.04% ========================================== Files 61 63 +2 Lines 2917 2963 +46 ========================================== + Hits 2288 2323 +35 - Misses 629 640 +11 ```

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