Update test factory usage to static method calls

[pfefferle]

Fixes #

Proposed changes:

• Replace $this->factory with self::factory() in test files to follow PHPUnit best practices

Other information:

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

Testing instructions:

• Run the test suite with npm run env-test
• Verify all tests pass with the updated factory syntax

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

[Copilot]

Pull request overview

This PR updates test factory usage across multiple test files to follow PHPUnit best practices by replacing instance property access ($this->factory) with static method calls (self::factory()).

Key changes:

• Updated factory access pattern from $this->factory to self::factory() in all test methods
• Changes are consistent across 8 test files covering integration tests, transformer tests, and handler tests
• All instances of the old pattern have been successfully migrated

Reviewed changes

Copilot reviewed 8 out of 8 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
tests/phpunit/tests/integration/class-test-stream-connector.php	Updated 2 factory calls in outbox processing test methods
tests/phpunit/tests/integration/class-test-akismet.php	Updated 2 factory calls in comment creation tests
tests/phpunit/tests/includes/transformer/class-test-post.php	Updated 8 factory calls across various post transformer tests
tests/phpunit/tests/includes/transformer/class-test-base.php	Updated 1 factory call in audience setting test
tests/phpunit/tests/includes/handler/class-test-undo.php	Updated 1 factory call in comment activity test
tests/phpunit/tests/includes/handler/class-test-reject.php	Updated 2 factory calls in reject handler test
tests/phpunit/tests/includes/handler/class-test-accept.php	Updated 2 factory calls in accept handler test
tests/phpunit/tests/includes/class-test-search.php	Updated 1 factory call in search test

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