Remove get_pixels calls

[delucchi-cmu]

Change Description

In preparation for addressing astronomy-commons/hats#142, this removes the get_pixels method in favor of get_healpix_pixels method to mirror what will be available on the Catalog API.

[codecov]

Codecov Report

Merging #148 (930f155) into main (8d1112f) will not change coverage.
Report is 2 commits behind head on main.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##              main      #148   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           24        24           
  Lines          983      1022   +39     
=========================================
+ Hits           983      1022   +39     

Files	Coverage Δ
src/hipscat_import/catalog/resume_plan.py	100.00% <100.00%> (ø)
...scat_import/margin_cache/margin_cache_arguments.py	100.00% <100.00%> (ø)
src/hipscat_import/pipeline_resume_plan.py	100.00% <100.00%> (ø)
src/hipscat_import/soap/resume_plan.py	100.00% <100.00%> (ø)

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