Fix and reformat earthquake distance tests

[tarnold17]

Fixes/Addresses/Summary/Motivation:

Reformat pareto/tests/test_earthquake_distance.py into multiple small tests instead of one large test, and mark with @pytest.mark.xfail the test which is failing in the GitHub environment.

Update codecov-action to v4 to hopefully resolve the persistent failures we're seeing using v2

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[ElmiraShamlou]

LGTM

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.33%. Comparing base (edff9c6) to head (9319fda).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #319      +/-   ##
==========================================
+ Coverage   89.30%   89.33%   +0.03%     
==========================================
  Files          33       33              
  Lines        5972     5989      +17     
==========================================
+ Hits         5333     5350      +17     
  Misses        639      639              

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