fix(test): merge unit test optimization branch

[lxcmyf]

What does this PR do?
merge unit test optimization branch into release_v4.7.2

Why are these changes required?

This PR has been tested by:

• Unit Tests
• Manual Testing

Follow up

Extra details

[codecov-commenter]

Codecov Report

Merging #5148 (e27c862) into release_v4.7.2 (0a3f2aa) will increase coverage by 0.99%.
The diff coverage is 88.88%.

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@@                 Coverage Diff                  @@
##             release_v4.7.2    #5148      +/-   ##
====================================================
+ Coverage             55.81%   56.81%   +0.99%     
- Complexity             8357     8485     +128     
====================================================
  Files                   836      836              
  Lines                 49592    49595       +3     
  Branches               5517     5517              
====================================================
+ Hits                  27682    28175     +493     
+ Misses                19693    19138     -555     
- Partials               2217     2282      +65     

Impacted Files	Coverage Δ
...src/main/java/org/tron/core/capsule/utils/RLP.java	25.63% <ø> (+6.72%)	⬆️
...re/net/service/nodepersist/NodePersistService.java	33.33% <83.33%> (+2.22%)	⬆️
...n/java/org/tron/core/db2/core/SnapshotManager.java	74.71% <100.00%> (+1.78%)	⬆️
...mework/src/main/java/org/tron/core/db/Manager.java	53.02% <100.00%> (-0.12%)	⬇️
...ore/net/messagehandler/TransactionsMsgHandler.java	21.25% <100.00%> (+0.99%)	⬆️

... and 38 files with indirect coverage changes

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