The Documents app now stores workflow tag conditions in a simpler structure, making rules easier to maintain and less prone to confusion. Tag names also show their category/facet alongside the tag, helping users distinguish similar tags when configuring or reviewing document workflows.

Refactoring of the tag conditions for workflow rules, after this commit
they are stored in two many2many fields instead of contained in a
`critera_tag_ids` record.

The second commit adds a name_get to `documents.tag` to display the
facet name.

Task: #1975015