Update EntityInstanceId.parse signature

[andystaples]

Updates the signature of EntityInstanceId.parse to reflect that it will always either return or throw. Also updates corresponding usages in the SDK

[Copilot]

Pull request overview

This PR updates the EntityInstanceId.parse method signature to reflect that it always returns an EntityInstanceId or throws a ValueError, rather than returning Optional[EntityInstanceId]. The changes update all call sites to use try-except blocks instead of checking for None.

• Changed method signature from Optional[EntityInstanceId] to EntityInstanceId
• Updated three usage sites to catch ValueError instead of checking for None return
• Improved error handling consistency across the SDK

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 2 comments.

File	Description
durabletask/entities/entity_instance_id.py	Updated parse method return type signature from Optional[EntityInstanceId] to EntityInstanceId
durabletask/worker.py	Updated two call sites to use try-except blocks for ValueError instead of checking for None
durabletask/entities/entity_metadata.py	Updated from_entity_response method to catch ValueError from parse instead of checking for None

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