ledger: move blockdb tests into a storage package (8 of N)

[icorderi]

Summary

This PR moves a left over test file to blockdb.

Previous parts of this refactor:

• part 1 - ledger: move pieces of accountdb.go into a storage package #4776
• part 2 - ledger: move catchpoint sql code into storage package #4813
• part 3 - ledger: move non-lookup methods into a storage package #4830
• part 4 - ledger: move catchpoint related methods into a storage package #4835
• part 5 - ledger: move catchpoint staging into a storage package (5 of N) #4836
• part 6 - ledger: move blockdb into a storage package (6 of N) #4841
• part 7 - ledger: move migrations into a storage package (7 of N) #4846

What remains to be moved out:

• setup stuff
  • table/index creations
  • table deletions
  • migrations
• iterators
  • orderedAccountsIter
  • catchpointPendingHashesIterator
• deltas
  • accountsLoadOld and resourcesLoadOld have a couple queries that we might want to move out to avoid pulling all the deltas into store

Test Plan

Existing tests.

[codecov]

Codecov Report

Merging #4860 (00cf6be) into master (00cf6be) will not change coverage.
The diff coverage is n/a.

❗ Current head 00cf6be differs from pull request most recent head a8c98cc. Consider uploading reports for the commit a8c98cc to get more accurate results

@@           Coverage Diff           @@
##           master    #4860   +/-   ##
=======================================
  Coverage   53.20%   53.20%           
=======================================
  Files         426      426           
  Lines       53904    53904           
=======================================
  Hits        28680    28680           
  Misses      22973    22973           
  Partials     2251     2251           

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