[Util] Add flag to backward compatibilities testing tool to continue verify when mismatching is found

[zhangchiqing]

The current backward compatibilities testing tool (verify execution result) will stop as soon as it found a mismatch. This PR adds a flag to control that and by default it will not stop but continue verifying.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 6.66667% with 14 lines in your changes missing coverage. Please review.

Project coverage is 41.08%. Comparing base (c8240d3) to head (a54d636).
Report is 2 commits behind head on master.

Files with missing lines	Patch %	Lines
cmd/util/cmd/verify_execution_result/cmd.go	0.00%	7 Missing ⚠️
engine/verification/verifier/verifiers.go	12.50%	7 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #6954   +/-   ##
=======================================
  Coverage   41.08%   41.08%           
=======================================
  Files        2120     2120           
  Lines      186100   186107    +7     
=======================================
+ Hits        76450    76457    +7     
+ Misses     103243   103242    -1     
- Partials     6407     6408    +1     

Flag	Coverage Δ
unittests	41.08% <6.66%> (+<0.01%)	⬆️

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