Fix: Prevent element dropping below 'New' Button

[SujithThirumalaisamy]

#10197
Issue: Elements were dropped after the "New" button, And placed back to last index after api refresh.
Solution: Moved the "New" button out of the Draggable to prevent the issue.

Previous behaviour: Reference #10197
Current behavious: Screencast.webm

[greptile-apps]

PR Summary

This PR fixes an issue in the Kanban board where draggable elements could be incorrectly dropped below the "New" button, causing inconsistent behavior after API refresh.

• Moved StyledNewButtonContainer outside of the draggable area in /packages/twenty-front/src/modules/object-record/record-board/record-board-column/components/RecordBoardColumnCardsContainer.tsx to prevent cards from being dropped after the "New" button
• Added isDragDisabled={true} to the bottom Draggable wrapper to ensure consistent behavior
• Ensures cards maintain their intended order within the droppable area by keeping the "New" button as a static element at the bottom

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