Remove deprecated functions, filters and actions

[pfefferle]

As we plan to have a major release next, we should cleanup the codebase and remove the deprecated functions.

I kept the most recent deprecations and some attributes we have not properly deprecated yet.

See #1703

Proposed changes:

Other information:

• Have you written new tests for your changes, if applicable?

Testing instructions:

• Go to '..'

Changelog entry

• Automatically create a changelog entry from the details below.

Changelog Entry Details

Significance

• Patch
• Minor
• Major

Type

• Added - for new features
• Changed - for changes in existing functionality
• Deprecated - for soon-to-be removed features
• Removed - for now removed features
• Fixed - for any bug fixes
• Security - in case of vulnerabilities

Message

Cleaned up the codebase and removed deprecated functions.

[Copilot]

Pull Request Overview

Removes deprecated functions, filters, actions, and corresponding tests in preparation for the next major release.

• Deletes legacy test methods for deprecated collection, dispatcher, and comment APIs
• Removes deprecated filter fallbacks and helper functions from core classes and functions
• Cleans up deprecated wrapper functions in activitypub.php and the Users collection class

Reviewed Changes

Copilot reviewed 11 out of 11 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
tests/includes/collection/class-test-actors.php	Deleted test for deprecated get_by_various
tests/includes/class-test-dispatcher.php	Deleted tests for deprecated dispatcher filters
tests/includes/class-test-comment.php	Deleted test for deprecated get_comment_type_names
includes/transformer/class-base.php	Removed deprecated activitypub_post_locale filter
includes/functions.php	Removed deprecated is_user_disabled and filter
includes/collection/class-users.php	Deleted entire deprecated Users collection class
includes/class-migration.php	Removed deprecated get_target_version method
includes/class-dispatcher.php	Removed deprecated maybe_add_inboxes_of_blog_user and filter fallback
includes/class-comment.php	Removed deprecated get_comment_type_names
activitypub.php	Removed deprecated get_plugin_meta and get_plugin_version wrappers
.github/changelog/1723-from-description	Added changelog entry for removal of deprecated code

Comments suppressed due to low confidence (3)

includes/functions.php:370

• The global function is_user_disabled() was removed; if any third-party or internal code still calls it, this will cause a fatal error. Ensure all references are updated or document the breaking change in your upgrade guide.

function is_user_disabled( $user_id ) {

tests/includes/collection/class-test-actors.php:68

• Removed the test for the deprecated get_by_various method. Consider adding tests for the new Actors::get_by_various behavior or documenting that legacy behavior is no longer supported.

public function test_deprecated_get_by_various( $item, $expected ) {

includes/class-dispatcher.php:45

• Fallback logic for the deprecated activitypub_send_to_inboxes and activitypub_interactees_inboxes filters was removed. Ensure consumers are updated to use activitypub_additional_inboxes exclusively.

// Fallback for `activitypub_send_to_inboxes` filter.

[obenland]

That looks beautiful 😍