chore: Phase out PriceQuality::Verified

[MartinquaXD]

With the backend trying to verify as many quotes as possible there is no reason to distinguish between Optimal and Verified anymore.

This PR tracks the work to phase out the verified variant. This is mostly a trivial code change in the backend but needs to be coordinated with the frontend so we don't discard quote requests due to deserialization errors.

[fleupold]

I think there may still be some value in this field. At least when sending the response back to the frontend it would be nice to indicate if the quote was verified (so that the frontend could show something to the user).

[github-actions]

This issue has been marked as stale because it has been inactive a while. Please update this issue or it will be automatically closed.

[github-actions]

This issue has been marked as stale because it has been inactive a while. Please update this issue or it will be automatically closed.