Add logs to merge

[janezpodhostnik]

Add extra logs to the merge function.

When doing account based migration only that one account should have changes.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 35.71429% with 18 lines in your changes are missing coverage. Please review.

Project coverage is 56.10%. Comparing base (c41bc8a) to head (1fc2d25).
Report is 3 commits behind head on feature/stable-cadence.

Files	Patch %	Lines
cmd/util/ledger/migrations/merge.go	28.00%	16 Missing and 2 partials ⚠️

Additional details and impacted files

@@                    Coverage Diff                     @@
##           feature/stable-cadence    #5484      +/-   ##
==========================================================
- Coverage                   56.21%   56.10%   -0.12%     
==========================================================
  Files                        1039      986      -53     
  Lines                      101283    96847    -4436     
==========================================================
- Hits                        56940    54337    -2603     
+ Misses                      40028    38323    -1705     
+ Partials                     4315     4187     -128     

Flag	Coverage Δ
unittests	56.10% <35.71%> (-0.12%)	⬇️

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[turbolent]

This can probably be a parameter. In NewDeploymentMigration, the value can be authorizer, i.e. where the contract is deployed to

[janezpodhostnik]

transactions will change more than just the authoriser account.
They might also change the global uuid counter.

[turbolent]

Nice! Thanks for adding this. Merging this into the WIP #5479