[CLIENT-2417] Only set as_partition_filter.as_partitions_status to a non-NULL value when set by the user in Python

[juliannguyen4]

…n python

• All the test cases in the test file test_scan_get_partitions_status.py are still in test_query_get_partitions_status.py, I believe
• Valgrind memory leaks for get_partitions_status are gone

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 68.18182% with 7 lines in your changes missing coverage. Please review.

Project coverage is 80.68%. Comparing base (8ff0327) to head (277604e).
Report is 6 commits behind head on dev.

Files with missing lines	Patch %	Lines
src/main/convert_partition_filter.c	61.11%	7 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##              dev     #683      +/-   ##
==========================================
- Coverage   80.89%   80.68%   -0.22%     
==========================================
  Files         100      100              
  Lines       15053    14903     -150     
==========================================
- Hits        12177    12024     -153     
- Misses       2876     2879       +3     

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