[Maintenance] fixing budget migration

[thetif]

Resolves budget migration issue

Description

I changed up the migration so that it does HITECH and MMIS separately because it seems to be having an issue setting the correct discriminator. I also changed the discriminators in the schemas to use constants.

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 #4644 (c71bd99) into main (153d84a) will decrease coverage by 6.37%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main    #4644      +/-   ##
==========================================
- Coverage   94.32%   87.95%   -6.37%     
==========================================
  Files         277      274       -3     
  Lines        8808     8603     -205     
  Branches     1773     1773              
==========================================
- Hits         8308     7567     -741     
- Misses        476      998     +522     
- Partials       24       38      +14     

Flag	Coverage Δ
api	∅ <ø> (∅)
common	99.33% <100.00%> (+<0.01%)	:arrow_up:
web	87.33% <ø> (-6.73%)	:arrow_down:

Impacted Files	Coverage Δ
common/utils/constants.js	100.00% <100.00%> (ø)

... and 25 files with indirect coverage changes

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[cms-eapd-bot]

This deploy was cleaned up.