feat: implement TransactionData#isUnvote

[faustbrian]

No description provided.

[codecov]

Codecov Report

Merging #516 into master will decrease coverage by 0.05%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master     #516      +/-   ##
==========================================
- Coverage   69.13%   69.08%   -0.06%     
==========================================
  Files          58       58              
  Lines        1173     1174       +1     
  Branches       85       85              
==========================================
  Hits          811      811              
- Misses        330      331       +1     
  Partials       32       32              

Flag	Coverage Δ
#unit	69.08% <0.00%> (-0.06%)	⬇️

Impacted Files	Coverage Δ
packages/platform-sdk-profiles/src/transaction.ts	2.50% <0.00%> (-0.07%)	⬇️

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