Squash migrations for 2.5.0 release

[sergei-maertens]

Trying something new where we squash migrations as part of the release process rather than after.

[codecov]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (b568b4d) 96.40% compared to head (c0384c3) 96.40%.

❗ Current head c0384c3 differs from pull request most recent head c825811. Consider uploading reports for the commit c825811 to get more accurate results

Files	Patch %	Lines
src/openforms/forms/migration_operations.py	50.00%	1 Missing ⚠️

Additional details and impacted files

@@                Coverage Diff                @@
##           release/2.5.0    #3796      +/-   ##
=================================================
- Coverage          96.40%   96.40%   -0.01%     
=================================================
  Files                706      706              
  Lines              22182    22184       +2     
  Branches            2534     2534              
=================================================
+ Hits               21385    21386       +1     
- Misses               549      550       +1     
  Partials             248      248              

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