Remove ingestion

[Ariana-B]

Reason for this pull request

Ingestion is marked as deprecated in 1.8.14; remove in 1.9

Proposed changes

• Remove everything ingestion-related

• Closes #xxxx

• Tests added / passed

• Fully documented, including docs/about/whats_new.rst for all changes

[codecov]

Codecov Report

Patch coverage: 42.85% and project coverage change: -0.86 ⚠️

Comparison is base (b198cc4) 85.54% compared to head (45e711b) 84.68%.

Additional details and impacted files

@@               Coverage Diff               @@
##           develop-1.9    #1465      +/-   ##
===============================================
- Coverage        85.54%   84.68%   -0.86%     
===============================================
  Files              134      132       -2     
  Lines            14993    14591     -402     
===============================================
- Hits             12826    12357     -469     
- Misses            2167     2234      +67     

Impacted Files	Coverage Δ
datacube/api/__init__.py	100.00% <ø> (ø)
datacube/model/__init__.py	95.51% <ø> (-0.59%)	⬇️
datacube/scripts/cli_app.py	100.00% <ø> (ø)
datacube/virtual/impl.py	72.30% <33.33%> (-0.59%)	⬇️
datacube/drivers/netcdf/driver.py	88.88% <100.00%> (-11.12%)	⬇️

... and 8 files with indirect coverage changes

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[SpacemanPaul]

Looks good to me. Nice to finally be clearing out some of the clutter.