Allow taxonomy filter with remote site posts when pulling content

[sanketio]

Note

This is a part 2 for #428, and a replacement for #1244 (which only supports category filter)

Description of the Change

This update enhances the "Pull" feature by enabling taxonomy-based filtering for content fetched from remote sites. It adds:

• Support for taxonomies: Editors can now narrow down pulls using category, tag, or custom taxonomy filters—improving efficiency when selecting remote content.
• Dynamic filter UI: Taxonomy filter options appear dynamically based on the remote source, ensuring only relevant filters are exposed.
• Backwards-compatible behavior: If no filters are applied, the pull interface behaves as before, preserving existing workflows.
• Developer-friendly hooks: Includes new filters/actions allowing customization of which taxonomies appear in the UI.
  • dt_allowed_pull_taxonomies - allows more taxonomy filters. By default, only category is allowed. This is a general filter for all the taxonomies supported by all the post-types.
  • dt_available_pull_taxonomy_terms - allows filtering the terms.
  • distributable_{$taxonomy}_terms - allows distributable terms based on the taxonomy.

How to test the Change

1. Open post pull screen
2. You should be able to see post categories in the filter by default, if the selected post-type supports it.
3. Based on the post-type change, the allowed taxonomy filters should be changes with the supported ones and available ones.
4. Select a taxonomy and filter. The posts should be filtered by the selected.
5. You should see the columns in the list table dynamically updated based on the supported taxonomies.
6. Pull the posts and verify only posts from that taxonomy term have been pulled, if the current site has that taxonomy registered.
7. Verify it on both internal and external connections.
8. Verify it in conjunction with post type filter as well.
9. Once the filter is applied, the Reset Filters button should be visible.
10. Clicking on Reset button should clear out the filters.

Changelog Entry

Added - Taxonomy filter for remote content pulls—allows filtering by category, tag, or custom taxonomy

Credits

Props @sanketio

Checklist:

• I agree to follow this project's Code of Conduct.
• I have updated the documentation accordingly.
• I have added Critical Flows, Test Cases, and/or End-to-End Tests to cover my change.
• All new and existing tests pass.

[sanketio]

@jeffpaul Is it okay if I merge this to the base PR: #1237? So that we have one place for the feature?

[jeffpaul]

@jeffpaul Is it okay if I merge this to the base PR: #1237? So that we have one place for the feature?

@dkotter @peterwilsoncc any concerns with this approach?

[dkotter]

@jeffpaul Is it okay if I merge this to the base PR: #1237? So that we have one place for the feature?

@dkotter @peterwilsoncc any concerns with this approach?

No, I think that's fine. I'll admit I'm a little confused on all the different PRs we have here so merging this into the main branch will help a bit

[sanketio]

Thanks, @dkotter! I have merged this to the main PR: #1237