Fix v0.33.x export script to port gov data correctly

[alexanderbez]

Update the python export script to properly migrate governance state. This state machine breaking change was included in the 0.34 release but was not documented and as a result was not included in the original script.

Note: A node will not panic if this fix is not included, however, querying for past proposals will fail.

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• Targeted PR against correct branch (see CONTRIBUTING.md)

• Linked to github-issue with discussion and accepted design OR link to spec that describes this work.

• Wrote tests

• Updated relevant documentation (docs/)

• Added a relevant changelog entry: sdkch add [section] [stanza] [message]

• rereviewed Files changed in the github PR explorer

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For Admin Use:

• Added appropriate labels to PR (ex. wip, ready-for-review, docs)
• Reviewers Assigned
• Squashed all commits, uses message "Merge pull request #XYZ: [title]" (coding standards)

[codecov]

Codecov Report

Merging #4163 into release/v0.34.1 will decrease coverage by 0.03%.
The diff coverage is n/a.

@@                Coverage Diff                 @@
##           release/v0.34.1   #4163      +/-   ##
==================================================
- Coverage            60.04%     60%   -0.04%     
==================================================
  Files                  212     212              
  Lines                15127   15127              
==================================================
- Hits                  9083    9077       -6     
- Misses                5421    5427       +6     
  Partials               623     623