Move update_publications make target outside of make data

[ptgolden]

This creates a separate make update_publications command which is separate from make data. The latter depends on an up-to-date Solr server to be running, while the former does not. It would be useful for people who don't continually run and update the Solr backend to be able to update the publications file.

[netlify]

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 70.97%. Comparing base (b953722) to head (c574fd9).
Report is 44 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #957      +/-   ##
==========================================
+ Coverage   70.75%   70.97%   +0.21%     
==========================================
  Files          91       91              
  Lines        3084     3128      +44     
==========================================
+ Hits         2182     2220      +38     
- Misses        902      908       +6     

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