2467: Refactor URN map generation and add notifications.

[vitaliyboykocontributor]

Extracted logic for handling XSD files and added clear notifications for the process status. Replaced Stack with Deque for better performance, introduced constants for reusable values, and updated plugin declarations with a notification group.

1. Fixes Slow operations are prohibited on EDT #2477
2. Fixes Urn mappings not working #2467

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• All new or changed code is covered with integration/functional tests (if applicable)
• All automated tests passed successfully (all builds are green)