Include DEA's new offshore territories tag

[jeremyh]

... and add a test case of a modern wagl output.

The added test data found a bug unrelated to the offshore territories: when the first measurement has no explicit CRS it fails with a reference error.

• (Bands don't all need to declare the CRS explicitly, because they should all be the same CRS. But this failed when it was the first band that was not explicit.)

I've also unwisely included a few housekeeping commits here.

• Enabled DTDs again fro the Modis packager. This was tightened some time ago for our securtiy linter, but the production datasets from the US require them. The processor was only recently upgraded to a (much) newer version of eodatasets so this was never picked up. -Pre-commit bump

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 83.33333% with 1 lines in your changes are missing coverage. Please review.

Project coverage is 84.44%. Comparing base (bd57906) to head (e080e1c). Report is 6 commits behind head on develop.

Files	Patch %	Lines
eodatasets3/prepare/nasa_c_m_mcd43a1_6_prepare.py	0.00%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## develop #335 +/- ## =========================================== + Coverage 84.37% 84.44% +0.06% =========================================== Files 26 26 Lines 4506 4506 =========================================== + Hits 3802 3805 +3 + Misses 704 701 -3 ```

:umbrella: View full report in Codecov by Sentry.
:loudspeaker: Have feedback on the report? Share it here.

[jeremyh]

(The Docker Push action is failing for an unrelated reason — missing dockerhub credentials. I'm not an repo admin so can't view/setup credentials https://github.com/opendatacube/eo-datasets/issues/336)