[amelia-c0n]

Summary

• Adds a per-button tooltip property to Button Group (SIMPLE and MENU triggers), matching the standalone Button widget (bindable text, Popover2 + Interweave).
• Tooltip is hidden while a MENU dropdown is open so the two popovers do not conflict.
• Nested menu items are unchanged.

Fixes https://linear.app/appsmith/issue/APP-16444
Related https://github.com/appsmithorg/appsmith-ee/issues/10479

Test plan

• Unit tests for property pane config, hover tooltip content, and empty tooltip
• Manual: set tooltips on SIMPLE buttons (icon-only and labeled); confirm hover shows Interweave content and JS bindings work
• Manual: set tooltip on a MENU trigger; confirm hover tooltip, then open menu and confirm tooltip hides
• Manual: existing Button Groups without tooltips render unchanged

Automation

/ok-to-test tags="@tag.Widget @tag.Button"

[linear-code]

APP-16444

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