feat(auth): use gnap error middleware on idp api

[njlie]

Changes proposed in this pull request

• Adds the gnapServerErrorMiddleware to the routes on the Identity Provider API on the auth server.

Context

Closes #3029.

This ended up being a one-line change, as the IDP responses were added already in the spec from #850 and #3024. The code already throws these errors and had tests added as of #2400. There was one potential response missing from the spec, however.

Checklist

• Related issues linked using fixes #number
• Tests added/updated
• Make sure that all checks pass
• Bruno collection updated (if necessary)
• Documentation issue created with user-docs label (if necessary)
• OpenAPI specs updated (if necessary)

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[mkurapov]

Would it be good to provide the actual GNAP response error objects in the IDP spec?

[njlie]

I'll add them since it's a pretty bare PR as it is right now

[mkurapov]

We can make my comment into a separate issue, if you'd like

[njlie]

I figured it might make sense to include this in the auth server spec as well for Open Payments, so I captured it in an issue here.

[mkurapov]

Makes sense! if you want, we could probably merge the open payments issue first, bump the client, and import the yaml files in here so we can reference them as ./auth-server.yaml#/components/schemas/..., what do you think? Unless we want to decouple the IDP spec from the auth server spec?

[njlie]

Let's bump the OP client for this 👍