Fix MP for make SAM files function

[ppinchuk]

Previously, make_SAM_files would overwrite the same file when num gids < num chunks. In this PR, we fix this by always adding a gid suffix if the user passes an iterable of GI's, even if that iterable only contains one value. The old behavior of not adding a suffix is preserved and explicitly tested for when the user intentionally passes a single GID (as an int) to the get_SAM_gid function.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 67.98%. Comparing base (65ca4a9) to head (482ad97).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #223      +/-   ##
==========================================
+ Coverage   67.85%   67.98%   +0.13%     
==========================================
  Files          40       40              
  Lines        7111     7113       +2     
  Branches     1043     1043              
==========================================
+ Hits         4825     4836      +11     
+ Misses       1958     1948      -10     
- Partials      328      329       +1     

Flag	Coverage Δ
unittests	67.98% <100.00%> (+0.13%)	⬆️

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Files with missing lines	Coverage Δ
rex/resource_extraction/resource_extraction.py	85.73% <100.00%> (+1.28%)	⬆️

... and 1 file with indirect coverage changes

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