Disable indent guides in Quick Pick trees to reduce visual noise

[Copilot]

Quick Pick trees (used for the Tools picker and other hierarchical selection interfaces) were displaying indent guides by default, which added visual noise and reduced readability. The vertical lines created unnecessary clutter in the tree interface, making it harder to focus on the actual content.

This change disables indent guides specifically for Quick Pick trees by setting renderIndentGuides: RenderIndentGuides.None in the tree configuration. The fix:

1. Imports RenderIndentGuides from the abstractTree module
2. Adds the renderIndentGuides: RenderIndentGuides.None option to the QuickInputTreeController tree configuration

This aligns the Quick Pick tree behavior with the existing Quick Pick list implementation, which already disables indent guides for the same reason. The change is minimal and surgical, affecting only the visual presentation without impacting any functionality.

Before: Tree shows distracting vertical indent guide lines
After: Clean tree interface without visual noise from indent guides

Fixes #259579.

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