Validation of requirement 11

[doublebyte1]

Describe the bug
The ETS expects Dataset Tilesets, which according to the spec are not a core requirement. See the discussion here.

To Reproduce
Run the tests for a server that does not implement dataset tilesets:

https://maps.gnosis.earth/ogcapi/?f=json
https://demo.pygeoapi.io/master/?f=json

The ets produces an error.

Expected behavior
These servers do not claim to support dataset tilesets in the conformance declaration, and should not be tested for it. Instead they support collection tilesets.

Additional context
geopython/pygeoapi#1728 (comment)

[dstenger]

Thanks for reporting.
Can you please check if pull request #29 solves your problem?

[doublebyte1]

@dstenger I think Tom tested it and it works fine now! Closing the issue, now. Thank you 🙏🏽