[jorgefilipecosta]

Backports WordPress/gutenberg#85186.

Removes single from the context values the entity actions registry supports, leaving list.

single came from the DataViews Action type, which describes context as "only a meta information for now". No screen shows the actions of that context: the editor's post actions menu calls usePostActions() without a context, so it keeps only the actions without one, and the lists keep list. A plugin could register an action with context => 'single' and get no notice, but the action would show nowhere. Removing it before 7.2 ships keeps the option to add it later with a defined meaning, rather than having to support it forever. The Gutenberg PR also removes it from the DataViews type.

This PR:

• Sets WP_Entity_Actions_Registry::SUPPORTED_VALUES['context'] to array( 'list' ), so single is reported with _doing_it_wrong(), like any other unsupported value, and is no longer in the /wp/v2/entity-actions schema enum.
• Uses single as the unsupported context in the invalid values test.

Testing Instructions

1. Register an action with 'context' => 'single' on wp_entity_actions_api_init and verify a _doing_it_wrong() notice names it ("context is not one of list.").
2. Verify the context property of OPTIONS /wp/v2/entity-actions only lists list.
3. Run npm run test:php -- --group entity-actions.

Trac ticket: https://core.trac.wordpress.org/ticket/66343

Use of AI Tools

AI assistance: Yes
Used for: writing the code and the tests, and drafting this description; reviewed and edited by me.

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[jorgefilipecosta]

Committed at 9ec9604.