Connect to new endpoint for fetching specifically task markers

[CollinBeczak]

resolves: #2354
Paired with and dependent on: maproulette/maproulette-backend#1130

Issue: The old endpoint used for fetching task markers was needlessly complex and slow.

This PR connect to the simpler endpoint used to fetch specifically marker data.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 2.38095% with 41 lines in your changes missing coverage. Please review.

Project coverage is 23.47%. Comparing base (cb886ce) to head (cd66497).

Files	Patch %	Lines
src/services/Task/BoundedTask.js	2.43%	27 Missing and 13 partials ⚠️
...ChallengeTaskClusters/WithChallengeTaskClusters.js	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2356      +/-   ##
==========================================
- Coverage   23.51%   23.47%   -0.04%     
==========================================
  Files         649      649              
  Lines       22502    22543      +41     
  Branches     6928     6962      +34     
==========================================
+ Hits         5292     5293       +1     
- Misses      14398    14425      +27     
- Partials     2812     2825      +13     

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