Add storage health check flags for atree migration

[fxamacker]

This PR adds debug flags to check storage health before and after atree migration.

• check-storage-health-before
• check-storage-health-after

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 13.79310% with 50 lines in your changes are missing coverage. Please review.

Project coverage is 55.54%. Comparing base (ad12394) to head (eaf2bc4).

Files	Patch %	Lines
...util/ledger/migrations/atree_register_migration.go	4.54%	40 Missing and 2 partials ⚠️
cmd/util/cmd/execution-state-extract/cmd.go	50.00%	4 Missing and 2 partials ⚠️
...execution-state-extract/execution_state_extract.go	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5636      +/-   ##
==========================================
- Coverage   55.55%   55.54%   -0.02%     
==========================================
  Files        1043     1043              
  Lines      102034   102092      +58     
==========================================
+ Hits        56689    56705      +16     
- Misses      40992    41030      +38     
- Partials     4353     4357       +4     

Flag	Coverage Δ
unittests	55.54% <13.79%> (-0.02%)	⬇️

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[fxamacker]

@janezpodhostnik @turbolent PTAL 🙏

[turbolent]

👍