Description of the Change

This PR returns the setup() method early if we are in a post editor context, as there's no need to run the facets code if we are adding/editing a post.

There's other alternatives to this like whitelisting blocks via allowed_block_types_all however we would need to know all blocks registered, which can be tricky.

Closes #2797

Alternate Designs

Possible Drawbacks

Verification Process

Checklist:

• I have read the CONTRIBUTING document.
• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have added tests to cover my change.
• All new and existing tests passed.

Changelog Entry

Fixed: Facet block can be used in the post editor.

Credits

Props @oscarssanchez