Update hash/id for on chain expiry notification generator

[tim-schultz]

We need to update the on chain expiry notification generator so that notifications are generated each time an attestation expires instead of just the first time. Currently only the first time a chain's attestation expires a notificaiton will be generated due to the hashing function. Ideally we should add an expiration date so that the notification is tied to a specific expiration

Acceptance Criteria GIVEN the existing encoded_data structure for a provider on a blockchain, WHEN an expiration_date field is added to the structure, THEN the encoded_data should include the new expiration_date field, AND the id should update each time a provider's expiration date changes.

Referenced file https://github.com/gitcoinco/passport-scorer/blob/1c74a37dcc76f65e301139885408fc12b1987d7f/api/passport_admin/notification_generators/on_chain_expired.py#L15