bugfix: prevent unintended shared metadata updates in function assign_and_map_hash_ids

[non-nil]

short description

This short PR addresses a bug in the assign_and_map_hash_ids function where multiple Element instances could share the same ElementMetadata instance.

This could inadvertently introduce unintended side effects when updating the parent_id.

original behavior

Here it will raise the KeyError since the underlying metadata object could have been updated earlier pointed by the other element associated with the same metadata object.

[sentry-io]

🔍 Existing Issues For Review

Your pull request is modifying functions with the following pre-existing issues:

📄 File: unstructured/documents/elements.py

Function	Unhandled Issue
assign_and_map_hash_ids	KeyError: 'd703f5515d88810d30db8779c12b0d18' /gen... Event Count: 1

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