Refactor login logic and add unique keys to Editor components

[cannarocks]

This pull request primarily refactors and simplifies the LoginPage authentication logic, removing the legacy WordPress login fallback and related error handling. It also introduces minor improvements to the bug detail description component to ensure correct re-rendering of the Editor component.

Authentication flow simplification:

• Removed the fallback to legacy WordPress login in LoginPage, so authentication now relies solely on Cognito. All related logic and error handling for WordPress login have been deleted.
• Removed the unused showGenericErrorToast function, as generic error handling for the legacy login is no longer needed.

Component improvements:

• Updated the Editor components in BugDetail/Description.tsx to include a key prop based on their respective content (step_by_step, expected_result, current_result). This ensures the editor re-renders properly when the content changes.

Code organization:

• Cleaned up and reordered imports in both BugDetail/Description.tsx and LoginPage/index.tsx for clarity and to remove unused dependencies (such as WPAPI and WrappedText). [1] [2]