fix: Updated reset configuration to use dialog instead of popover which now closes on X button click, Submit Button Now Resets Widgets to default values by clearing config

[Vamshi-Microsoft]

This pull request refactors the reset configuration functionality in code/backend/pages/04_Configuration.py to improve user experience and code clarity. The changes replace the previous popover-based implementation with a dialog-based approach, streamline the reset process, and ensure better state management.

Does this introduce a breaking change?

• Yes
• No

[Vamshi-Microsoft]

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[Vamshi-Microsoft]

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