Clean up TODO comments

[meta-paul]

Address/remove TODO comments in the Prolific Integration code

[codecov-commenter]

Codecov Report

Patch coverage has no change and project coverage change: +0.05% 🎉

Comparison is base (a5a90f2) 60.36% compared to head (530295c) 60.42%.
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1050      +/-   ##
==========================================
+ Coverage   60.36%   60.42%   +0.05%     
==========================================
  Files         155      155              
  Lines       11811    11811              
==========================================
+ Hits         7130     7137       +7     
+ Misses       4681     4674       -7     

Files Changed	Coverage Δ
...o/abstractions/providers/prolific/api/constants.py	100.00% <ø> (ø)
...ement_classes/age_range_eligibility_requirement.py	58.33% <ø> (ø)
.../abstractions/providers/prolific/prolific_agent.py	27.92% <ø> (ø)
...tractions/providers/prolific/prolific_datastore.py	29.37% <ø> (ø)
...o/abstractions/providers/prolific/prolific_unit.py	19.56% <ø> (ø)
.../abstractions/providers/prolific/prolific_utils.py	19.07% <ø> (ø)

... and 2 files with indirect coverage changes

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.