Test db build

[SpacemanPaul]

Current test db uses a db dump for STAC indexed data. This is brittle to schema changes and adding multi-db support.

Ideally I'd just use stac-to-dc but it's not migrated to 1.9 yet.

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📚 Documentation preview 📚: https://datacube-ows--1021.org.readthedocs.build/en/1021/

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 93.52%. Comparing base (722bc6e) to head (71c9528).
Report is 34 commits behind head on develop-1.9.

Additional details and impacted files

@@               Coverage Diff               @@
##           develop-1.9    #1021      +/-   ##
===============================================
- Coverage        93.77%   93.52%   -0.26%     
===============================================
  Files               46       46              
  Lines             6573     6622      +49     
===============================================
+ Hits              6164     6193      +29     
- Misses             409      429      +20     

Files with missing lines	Coverage Δ
datacube_ows/feature_info.py	89.36% <100.00%> (+0.05%)	⬆️
datacube_ows/ogc_utils.py	96.19% <100.00%> (ø)

... and 4 files with indirect coverage changes