stac: use datacube's ds2stac

[pjonsson]

Replace the old EO3->STAC conversion
code with a call into datacube instead.

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📚 Documentation preview 📚: https://datacube-explorer--1062.org.readthedocs.build/en/1062/

[codecov]

Codecov Report

❌ Patch coverage is 12.50000% with 7 lines in your changes missing coverage. Please review.
✅ Project coverage is 70.10%. Comparing base (2c753e2) to head (c5eae23).

Files with missing lines	Patch %	Lines
cubedash/_stac.py	12.50%	7 Missing ⚠️

❌ Your project check has failed because the head coverage (70.10%) is below the target coverage (80.00%). You can increase the head coverage or adjust the target coverage.

❗ There is a different number of reports uploaded between BASE (2c753e2) and HEAD (c5eae23). Click for more details.

HEAD has 2 uploads less than BASE

Flag	BASE (2c753e2)	HEAD (c5eae23)
	4	2

Additional details and impacted files

@@             Coverage Diff              @@
##           develop    #1062       +/-   ##
============================================
- Coverage    83.95%   70.10%   -13.86%     
============================================
  Files           35       35               
  Lines         4295     4288        -7     
  Branches       540      536        -4     
============================================
- Hits          3606     3006      -600     
- Misses         493     1117      +624     
+ Partials       196      165       -31     

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[pjonsson]

This makes the test emit a raw None in the STAC output for nodata value for some raster bands, so putting this in draft for now.

I think the issue will be fixed by opendatacube/datacube-core#2402.

[Ariana-B]

This is a little awkward - I was previously working on this same update but for some reason never pushed up the branch.
Since there are some differences in our implementations, I've made it a draft PR so we can compare and consolidate: #1065

[pjonsson]

Well, I don't know what I'm doing in these areas and the PR isn't working so I don't have any particular fondness of keeping this branch. Can you approve #1061 so we get the simple changes merged to start with, and then we work from there?