fix: Resolve pagination issue by fetching last content directly from the database

[PruthiviRaj27]

Issue:

• Pagination was not working correctly for running content due to the incorrect retrieval of the last item in the list.
• Previously, PagingState was used to get the last item, which did not always return the correct content.
• This caused LoadType.APPEND to fail since it couldn't determine the next page properly.

Fix:

• Replaced PagingState lookup with a database query getLastContent to fetch the last content item based on contentOrder.
• Updated the getRemoteKeyForLastItem method to use this database query instead of relying on state.pages.
• Simplified getPageNumber logic by removing the unused state parameter.