[Access] Use Indexed height when checking payer balance

[AndriiDiachuk]

In this PR was changed block height for checking payer balance. Instead of using the latest sealed block, was used the latest indexed block.

Related PR: onflow/flow-emulator#724

Closes: #6129

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 25.53191% with 35 lines in your changes missing coverage. Please review.

Project coverage is 41.27%. Comparing base (7d782c8) to head (0a7f162).

Files with missing lines	Patch %	Lines
access/mock/blocks.go	0.00%	17 Missing ⚠️
access/validator.go	37.50%	9 Missing and 1 partial ⚠️
cmd/access/node_builder/access_node_builder.go	0.00%	4 Missing ⚠️
cmd/observer/node_builder/observer_builder.go	0.00%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #6292      +/-   ##
==========================================
- Coverage   41.28%   41.27%   -0.02%     
==========================================
  Files        2030     2030              
  Lines      145837   145865      +28     
==========================================
- Hits        60213    60202      -11     
- Misses      79397    79437      +40     
+ Partials     6227     6226       -1     

Flag	Coverage Δ
unittests	41.27% <25.53%> (-0.02%)	⬇️

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[Guitarheroua]

Looks good to me, just has a couple of minor comments.

[peterargue]

added a suggestion for phrasing one of the comments. otherwise this looks good

[peterargue]

@AndriiDiachuk please fix conflicts

[peterargue]

@AndriiDiachuk looks like there's some more conflicts to fix. can you take a look