Fix Enter key behavior on last cell in datagrid #2347

[gitRasheed]

This PR addresses issue #2347.

Changes made:

• Modified the keydownListener function in src/js/event_handlers/keydown/edit_keydown.js
• Added logic to detect when the last cell is being edited and implemented behavior to save content and remove focus when Enter is pressed on the last cell

Testing:

• Tested with various datasets to ensure the new behavior works as expected
• Verified that existing functionality for non-last cells remains unchanged