[Verification] Adds type and value assertion for assigner tests

[yhassanzadeh13]

This PR addresses a comment of @zhangchiqing on an earlier PR for the assigner engine of verification node.

... update the assertion on the chunkQueues.StoreChunkLocator call, to assert the arguments passed into the calls.

[codecov-commenter]

Codecov Report

Merging #1065 (ee356ea) into master (fd4a4bb) will decrease coverage by 0.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #1065      +/-   ##
==========================================
- Coverage   53.34%   53.32%   -0.02%     
==========================================
  Files         318      318              
  Lines       21559    21559              
==========================================
- Hits        11501    11497       -4     
- Misses       8486     8491       +5     
+ Partials     1572     1571       -1     

Flag	Coverage Δ
unittests	53.32% <ø> (-0.02%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
...sus/approvals/assignment_collector_statemachine.go	42.30% <0.00%> (-4.81%)	⬇️
cmd/util/ledger/migrations/storage_v4.go	42.16% <0.00%> (+0.60%)	⬆️

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