Report additional logs in metrics migration

[SupunS]

No description provided.

[SupunS]

cc: @j1010001 I addressed one of the TODOs (i.e: also consider the "contract type" itself for the metrics) which may have caused a discrepancy on the reported number. In case if it didn't solve, the added additional log should give us enough info to narrow down the issue.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 57.14286% with 6 lines in your changes missing coverage. Please review.

Project coverage is 55.85%. Comparing base (50ec918) to head (e1a73de).
Report is 26 commits behind head on master.

Files	Patch %	Lines
...l/ledger/migrations/migration_metrics_collector.go	57.14%	5 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #6024      +/-   ##
==========================================
- Coverage   55.86%   55.85%   -0.02%     
==========================================
  Files        1131     1133       +2     
  Lines       89499    89974     +475     
==========================================
+ Hits        50003    50257     +254     
- Misses      34732    34930     +198     
- Partials     4764     4787      +23     

Flag	Coverage Δ
unittests	55.85% <57.14%> (-0.02%)	⬇️

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[fxamacker]

LGTM! I only reviewed general Go programming aspect.