Fix support for opening local files in spreadsheet/SV inspector

[cmdcolin]

This fixes the ability to open local files in spreadsheet/sv inspector. This was a regression following the change of our FileSelector to return the objects with blobId instead of blob from #1975

[codecov]

Codecov Report

Merging #2074 (2aa7f3a) into main (24dc8b4) will increase coverage by 0.02%.
The diff coverage is 50.00%.

@@            Coverage Diff             @@
##             main    #2074      +/-   ##
==========================================
+ Coverage   61.38%   61.41%   +0.02%     
==========================================
  Files         479      479              
  Lines       22908    22908              
  Branches     5249     5249              
==========================================
+ Hits        14062    14068       +6     
+ Misses       8571     8565       -6     
  Partials      275      275              

Impacted Files	Coverage Δ
...iew/src/SpreadsheetView/components/ImportWizard.js	78.94% <ø> (ø)
...et-view/src/SpreadsheetView/models/ImportWizard.ts	70.70% <50.00%> (ø)
packages/core/util/index.ts	78.30% <0.00%> (ø)
...nts/src/SNPCoverageRenderer/SNPCoverageRenderer.ts	87.65% <0.00%> (+7.40%)	⬆️

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[cmdcolin]

I think implementing sv inspector/spreadsheet in typescript could maybe help avoid some regressions like this. Maybe we can merge this for now though