Fix various code around Message.interaction(_metadata)

[Soheab]

Summary

Fix some stuff that was missed in the initial PR:

1. The original_response_message and interacted_message properties on MessageInteractionMetadata are not marked as Optional.
2. A weird unformatted deprecation message emitted from Message.interaction.
3. The library uses the interaction attribute internally for dispatching views so it was always emitting the deprecation message with no way to "fix" it.

Checklist

• If code changes were made then they have been tested.
  • I have updated the documentation to reflect the changes.
• This PR fixes an issue.
• This PR adds something new (e.g. new method or parameters).
• This PR is a breaking change (e.g. methods or parameters removed/renamed)
• This PR is not a code change (e.g. documentation, README, ...)