Update OIDC client code to retry if the request failed with Connection Was Closed

[sberyozkin]

Description

It affects both quarkus-oidc and quarkus-oidc-client - if the connection error has happened after the initial connection was established, for ex, the connection was dropped, then, as recommended by Clement, it makes sense to retry.

Implementation ideas

I've seen this Connection was closed only once, today, so it is quite rare - but for the moment I'll just add say 3 retries with a 1/2 sec delay between the retries, which should be sufficient - later on we can also configure it better - but for now I'd like to avoid users configuring for ex a 5 secs delay between the retries or retry for 1 min etc
CC @cescoffier

[quarkus-bot]

/cc @pedroigor