OIDC - Support Policy per path (location block)

[brianehlert]

The OIDC Policy can currently be associated with a VirutalServer but not with a VirtualServerRoute. If a user attempts to have a different OIDC Policy per location they are blocked by business logic and a message informing them this is not possible.

Counter this experience with the OIDC implementation with NGINX where different locations can have different IdPs.
This is the experience customers are seeking with NIC. The ability to have multiple OIDC policies and those can be associated with individual paths.
For reference, this is possible today with the JWT Policy.

AC:

• unlock the ability to assign OIDC Policy uniquely per path
• update the OIDC implementation to enable this use case
• continue to support the OIDC customization options customers enjoy today
• How NGINX conf is supposed to look