[GEN-2074]: Implement polling mechanism for refetching data in useSourceCRUD

[BenElferink]

This pull request introduces changes to the frontend/webapp/hooks/sources/useSourceCRUD.ts file to improve the polling mechanism and notification handling. The most important changes include adding a new startPolling function and modifying the handleComplete function to use this new polling mechanism.

Polling mechanism improvements:

• Added a startPolling function using useCallback to handle retry logic for polling with a maximum of 5 retries and a 1-second interval between retries.
• Modified the handleComplete function to call startPolling instead of directly calling refetch.

Import statement update:

• Added useCallback import from react to support the new startPolling function.

[notion-workspace]

Add Polling after source CRUD