describe-changes@v1: with concatenate mode: append

✨ PR Description

Purpose: Add automated tests for Hello Theme admin home page and implement required functionality to ensure testability.
Main changes:

• Added Playwright tests for Hello Theme admin home page functionality
• Implemented ensure_elementor_page_exists() to create test pages when needed
• Updated get_open_homepage_with_tab() to support direct page references
• Modified user meta setup to prevent announcement popups during testing

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