Provide limited redirect support for OIDC Web client when auto-redirect is disabled

[sberyozkin]

Description

Sometimes, when quarkus-oidc (or other OIDC extension) calls OIDC provider endpoints like the discovery one, the OIDC provider will send a redirect request to the same discovery endpoint but with some cookies.

Quarkus OIDC uses Vert.x WebClient. As far as managing redirects is concerned, WebClient follows redirects by default, with some addition work required at the Vert.x level to deal with such redirects.

If the auto-redirect is disabled, then Quarkus OIDC should allow a single, same URI redirect, only if the cookies are available. Essentially it is a single safe retry case in case of the redirect since the request does not follow a new URI.

Implementation ideas

No response

[quarkus-bot]

/cc @pedroigor (oidc)