Userinfo cache does not check for expiry

[kobergj]

The userinfo cache, which caches the oidc tokens in the proxy service has only a ttl of 10s. This is because is don't check the expiry of cached tokens. It relied on a ttl it set per record, but this is not working in nats-js-kv

The proxy service should check the expiration even if it pulled it from the cache. This would allow us to increase the ttl and reduce pressure on the idp