Drop hive columns on re-import.

[delucchi-cmu]

Testing is a little tricky, as existing test catalogs no longer have the hive columns (e.g. Norder, Dir, Npix). However, we want to drop those columns when re-importing.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 92.65%. Comparing base (87aef5e) to head (91d6b7d).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #621      +/-   ##
==========================================
+ Coverage   92.64%   92.65%   +0.01%     
==========================================
  Files          32       32              
  Lines        1998     2001       +3     
==========================================
+ Hits         1851     1854       +3     
  Misses        147      147              

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