Add unittests for Prolific integration (2)

[meta-paul]

More unittests to cover prolific_utils module and BaseAPIResource instances

[codecov-commenter]

Codecov Report

Patch coverage: 25.00% and project coverage change: -0.15% ⚠️

Comparison is base (fb909e7) 60.51% compared to head (ee8e2b5) 60.36%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1047      +/-   ##
==========================================
- Coverage   60.51%   60.36%   -0.15%     
==========================================
  Files         155      155              
  Lines       11807    11811       +4     
==========================================
- Hits         7145     7130      -15     
- Misses       4662     4681      +19     

Files Changed	Coverage Δ
...ctions/providers/prolific/api/base_api_resource.py	44.31% <0.00%> (-1.04%)	⬇️
.../abstractions/providers/prolific/prolific_utils.py	19.07% <0.00%> (-0.06%)	⬇️
...isto/abstractions/providers/prolific/api/status.py	100.00% <100.00%> (ø)

... and 2 files with indirect coverage changes

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