clean up budget migrations

[thetif]

Resolves budget migration issues

Description

Tested on staging directly this time, so it is working. The issue was that the existing budgets didn't have a discriminator, so they couldn't be found by HITECHBudget or MMISBudget to be updated. Also, when I tried just updating them using Budget without setting the __t it wasn't adding the discriminator and losing the specific data. So in future migrations when you need to update an APD or Budget that hasn't been retrieved using their specific versions. You need to update them with the generic model and set the discriminator by hand.

This pull request is ready to code review when

• [ ] Pull request has been labeled, if applicable with feature, content, bug, tests, refactor

This pull request is ready to test when

• [ ] Code has been reviewed by someone other than the original author

[codecov[bot]]

Codecov Report

Merging #4646 (317f698) into main (6901dea) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##             main    #4646   +/-   ##
=======================================
  Coverage   94.32%   94.32%           
=======================================
  Files         277      277           
  Lines        8816     8816           
  Branches     1773     1773           
=======================================
  Hits         8316     8316           
  Misses        476      476           
  Partials       24       24           

Flag	Coverage Δ
api	∅ <ø> (∅)
common	99.33% <ø> (ø)
web	94.06% <ø> (ø)

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[cms-eapd-bot]

This deploy was cleaned up.