Dragging nodes in the Hierarchy when a search is active should not be blocked by default.

Currently, we cannot start any drag operation in the hierarchy if a search is active, which prevents dragging filtered nodes into other windows, like the inspector for example. It should only be blocked when trying to reorder nodes (during drag update) or by the handlers themselves when dropping from external sources.

Steps to reproduce:

1. Open any project and any scene. Make sure the HierarchyV2 is active and there is a game object in the scene.
2. Type anything in the search field so that the game object is shown.
3. Try to drag the game object to the project browser to create a prefab.

Actual results: The game object cannot be dragged.

Expected results: The game object is dragged and a prefab is created.

Reproducible with versions: 6000.6.0b9, 6000.7.0a5

Not reproducible with versions: 

Can’t test with versions: 

Tested on (OS): Windows 11

Notes:

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