[docs] Add schema QC for schema 2.4.0

[pablo-gar]

See associated notebook in PR

Relates to #1435

QC results

Light QC on test build shows no issues

Checks

✅ High-level data is accesible and looks in order for census["census_info"] and census["census_data"]

✅ Expected increase in cells from latest LTS 154M to 211M

✅ Similar expected increase in other categories (datasets, donors, unique cells)

❌ Duplicated rows for homo_sapiens and mus_musculus in census_new["census_info"]["organisms"]

✅ All assays increased in N cells, no decreases

✅ Normalized layer was properly created

✅ Normalized layer was properly created for full-gene sequencing asssays

✅ Spot checking obs and var contents across all organisms shows compliance with Discover schema 7.0.0

✅ Spot checking expression matrices across all organisms shows expected values

✅ Anndata exporting works for all organisms

Real use-case test

See this notebook for a real use case as described here

✅ No issues found

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 91.63%. Comparing base (7d3ab1b) to head (c2082c5).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1438   +/-   ##
=======================================
  Coverage   91.63%   91.63%           
=======================================
  Files          75       75           
  Lines        5844     5844           
=======================================
  Hits         5355     5355           
  Misses        489      489           

Flag	Coverage Δ
unittests	91.63% <ø> (ø)

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