OIDC should support Authorization,Token and Userinfo endpoints if well-known configuration endpoint is not present on provider

While configuring OIDC provider i encounter that provider it doesnt expose /.well-known/openid-configuration endpoint. But it has all Authorization endpoint ,Token endpoint and Userinfo endpoint. But current implementation doesn't support it.

Can you please support to overwrite these endpoint in vault auth configuration

Start at the OIDC provider configuration and discovery path, then trace how authorization, token, and userinfo endpoints are currently sourced. Done means the configuration can override all three endpoints when the provider lacks /.well-known/openid-configuration, with tests covering that provider setup.

Written by the indexing model from the issue text.