fix: remove stale State entry from haystack.dataclasses lazy import structure

[Kropiunig]

PR #9578 removed the state submodule (haystack/dataclasses/state.py) and its TYPE_CHECKING import, but left the "state": ["State"] entry in the _import_structure dict that drives the lazy importer. As a result State still appears in dir(haystack.dataclasses), yet from haystack.dataclasses import State raises ModuleNotFoundError: No module named 'haystack.dataclasses.state'. This removes the stale entry so the public namespace matches reality (the real State now lives in haystack.components.agents).

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[sjrl]

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[sjrl]

Hey @Kropiunig just checking in if you saw my previous comment