bb: Investigate different proofs being created when proving key is not manually initilaised

[Maddiaa0]

Overview

As shown in #3215 bb will create failing proofs if the proving key is not initialised manually. There is a discrepancy between the init implementations and the create_proof init that should be lined up

As described by @charlielye

When calling prove_and_verify, we are always creating the circuit/pk with the witness data and flag not set. prove_and_verify is guaranteed not to fail in this regard. It's faster as it only builds the circuit once, but exposes us to this class of error.

[kevaundray]

Related to #1831

[Maddiaa0]

this was a discrepancy between running the circuit builder at vk time with a dummy circuit and proving time, this has since been fixed