feat : Add Node column to Events table in Overview (#4920)

[Utkarshpandey0001]

This PR addresses a feature request to add a "Node" column to the global Events table on the Cluster Overview page. It allows users to quickly see if warnings or errors are mostly isolated to a particular machine.

As requested, this column is completely optional. It is hidden by default (show: false) so it does not clutter the default view, but it exists as a selectable option within the "Show/Hide Columns" picker in the events table header.

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Pull request overview

Adds an optional “Node” column to the Cluster Overview global Events table to help identify whether warnings/errors are concentrated on a specific machine, while keeping the default table uncluttered by hiding the column initially.

Changes:

• Introduced a new Events table column (id: 'node') labeled “Node”.
• Populated the column from event.source?.host and set it to show: false by default (available via the column chooser).

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