feat(freezeV2): optimize msg format

[lxcmyf]

What does this PR do?
optimize msg format
Why are these changes required?

This PR has been tested by:

• Unit Tests
• Manual Testing

Follow up

Extra details

[codecov-commenter]

Codecov Report

Merging #5267 (7b50828) into release_v4.7.2 (eb8ffa1) will increase coverage by 0.13%.
The diff coverage is 100.00%.

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@@                 Coverage Diff                  @@
##             release_v4.7.2    #5267      +/-   ##
====================================================
+ Coverage             60.63%   60.76%   +0.13%     
- Complexity             9161     9177      +16     
====================================================
  Files                   839      839              
  Lines                 49902    49907       +5     
  Branches               5554     5555       +1     
====================================================
+ Hits                  30260    30328      +68     
+ Misses                17271    17201      -70     
- Partials               2371     2378       +7     

Impacted Files	Coverage Δ
...rc/main/java/org/tron/core/utils/ProposalUtil.java	31.62% <ø> (ø)
...g/tron/core/actuator/DelegateResourceActuator.java	87.19% <100.00%> (+0.40%)	⬆️

... and 16 files with indirect coverage changes

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