Issue #2620134: Views UI preview does not respect changed 'path' option until saving

The Views UI preview path did not reflect changes made to the 'path' option until the view was saved. This update ensures that the preview correctly reflects the modified path without requiring a save.

Changes:

• Updated getPreviewPath() to compute the updated preview path dynamically.
• Ensured proper handling of leading / in the path.
• Improved output to display both the current and updated paths.
• Fixed code formatting issues and adherence to Drupal coding standards.

Closes #2620134