[COST-4866] add csi_driver and csi_volume_handle to storage reports

[maskarb]

• add csi_driver and csi_volume_handle to storage reports

I did not add a full set of data for the second volume in the example report, but I included enough to show what happens when the csi_driver and csi_volume_handle do not exist in the metrics: they go into the report as a blank entry.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 86.12%. Comparing base (87f86f7) to head (0f2f340).
Report is 1 commits behind head on main.

❗ Current head 0f2f340 differs from pull request most recent head c7c60e6. Consider uploading reports for the commit c7c60e6 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #335      +/-   ##
==========================================
+ Coverage   86.09%   86.12%   +0.02%     
==========================================
  Files          13       13              
  Lines        2165     2169       +4     
==========================================
+ Hits         1864     1868       +4     
  Misses        220      220              
  Partials       81       81              

Flag	Coverage Δ
unittests	86.12% <100.00%> (+0.02%)	⬆️

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

Files	Coverage Δ
internal/collector/types.go	100.00% <100.00%> (ø)

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