fix: biosamples search total count

[v-rocheleau]

Fixes the discrepancy in biosample counts between public-search and beacon.

• compute total count with all categories, even those with missing values or below threshold
• return stats_list containing only the categories that respect the threshold.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 88.58%. Comparing base (5848709) to head (00cf6e7).

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #523      +/-   ##
===========================================
+ Coverage    88.55%   88.58%   +0.03%     
===========================================
  Files          131      131              
  Lines         4822     4820       -2     
  Branches       714      713       -1     
===========================================
  Hits          4270     4270              
+ Misses         396      395       -1     
+ Partials       156      155       -1     

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[davidlougheed]

• bump version to 8.0.1 so we can release right away
• eventually a test might be nice here, but for now we should focus on getting v16 out

[davidlougheed]

lgtm - this does make some small cells a bit more obvious; another argument for future quantization maybe.