Closes: https://github.com/fleetdm/confidential/issues/6069
Changes:
- Added a new route going to the create-vanta-authorization-request
action: `/api/v1/create-external-vanta-authorization-request`
- Added a new input to the create-vanta-authorization-request action:
`sharedSecret` - A secret that must match
`sails.config.custom.sharedSecretForExternalVantaRequests` when an
external request is made to the
`/api/v1/create-external-vanta-authorization-request` endpoint
- Updated the authorization URL returned by the
create-vanta-authorization-request endpoint
- Updated the redirect in the view-vanta-authorization endpoint (if a
redirect URL is provided) to not use res.redirect() (it causes 500
errors) when redirecting users.