access to public datasets in pages is prevented for anonymous users

[martenson]

found by @yvanlebras

When public dataset is included in a Galaxy Page and the page is accessed by an anonymous user they'll get a 403 error:

GET https://ecology.usegalaxy.eu/api/datasets/4838ba20a6d8676504b8a214b2e630da/get_content_as_text

API authentication required for this request 403

This is likely due to the get_authenticated_user check on the following line:
https://github.com/galaxyproject/galaxy/blob/dev/lib/galaxy/webapps/galaxy/services/datasets.py#L613

Galaxy Version and/or server at which you observed the bug
Galaxy Version: usegalaxy.eu {"version_major":"23.0","version_minor":"1.dev0"}

Expected behavior
Dataset should be accessible to anon users based on its permissions.

[yvanlebras]

Thank you so much @martenson for making the bridge from my question to this issue, and for identifying the origin of the issue! Hope all is ok on your side! Have a nice end of week Martin!

[hexylena]

technically a duplicate of a subitem in #15220 but maybe since this is its own issue it'll get more attention?