Ricecooker tagging: Adding tags via ricecooker is broken

[rtibbles]

Observed behavior

Adding tags via ricecooker uses an unsupported API https://github.com/learningequality/studio/blob/unstable/contentcuration/contentcuration/views/internal.py#L645

and does not work

Expected behavior

Should use node.tags.set(tags) instead.

Errors and logs

WARNING  WARNING: The following nodes have one or more descendants that could not be created:
WARNING  	Foraging Food (TopicNode): 1 descendant (Direct assignment to the forward side of a many-to-many set is prohibited. Use tags.set() instead.)

[rtibbles]

Fixed in #3201