[23.1] Adds biii as supported xref reference type

[kostrykin]

Adds biii to the list of supported xref references. This enables annotating tools using the biii.eu ontology:

<xrefs>
  <xref type="biii">scikit-image</xref>
</xrefs>

Essentia

How to test the changes?

(Select all options that apply)

• I've included appropriate automated tests.
• This is a refactoring of components with existing test coverage.
• Instructions for manual testing are as follows:
  1. [add testing steps and prerequisites here if you didn't write automated tests covering all your changes]

License

• I agree to license these and all my past contributions to the core galaxy codebase under the MIT license.

[github-actions]

This PR was merged without a "kind/" label, please correct.