chore: transform request even for before request hooks failure

[VisargD]

Title:

• transform request even for before request hooks failure

Description: (optional)

• After the redaction guardrails went live, before_request_hooks now have the capability of updating request body. So the request body transform (OAI to provider format) was moved after the hook execution to use the hook-transformed request for the final provider request transformation. But if a hook fails with deny=true (446 response status code), then we are not transforming the request body to provider format. Its getting set as {} in the request options.
• It does not affect any of the gateway functionalities but its better to keep the logic streamlined.

Related Issues: (optional)

• Related Feat: redaction guardrails revamp #889