Auth provider server accepts unhandler requests

We have observed the following flakes:

+-------+----------------------------------+-----------------------------------------------------
| Ended | Job                              | Url
+-------+----------------------------------+-----------------------------------------------------
| 2h    | main/run-tests-periodic          | https://ci.korifi.cf-app.com/teams/main/pipelines/main/jobs/run-tests-periodic/builds/13087
| 134d  | main/run-tests-periodic          | https://ci.korifi.cf-app.com/teams/main/pipelines/main/jobs/run-tests-periodic/builds/9873
| 275d  | main/run-tests-periodic          | https://ci.korifi.cf-app.com/teams/main/pipelines/main/jobs/run-tests-periodic/builds/6213
| 287d  | main/run-tests-periodic          | https://ci.korifi.cf-app.com/teams/main/pipelines/main/jobs/run-tests-periodic/builds/5890
| 317d  | main/run-tests-periodic          | https://ci.korifi.cf-app.com/teams/main/pipelines/main/jobs/run-tests-periodic/builds/5045
| 451d  | main/run-tests-periodic          | https://ci.korifi.cf-app.com/teams/main/pipelines/main/jobs/run-tests-periodic/builds/1404
| 490d  | main/run-tests-main              | https://ci.korifi.cf-app.com/teams/main/pipelines/main/jobs/run-tests-main/builds/88
| 493d  | main/run-tests-periodic          | https://ci.korifi.cf-app.com/teams/main/pipelines/main/jobs/run-tests-periodic/builds/259

Something is trying to call /healthz on the oidc provider which fails
because unhandled requests are not allowed. We hope that by allowing
them (dafault response will be 500) we could find out more about what is
calling the endpoint.

Co-authored-by: Danail Branekov <danailster@gmail.com>

api/authorization/testhelpers/auth_provider.go

@@ -119,7 +119,7 @@ func configureServer(server *ghttp.Server, signingKey *rsa.PrivateKey) {
 	applicationJSONHeader := http.Header{}
 	applicationJSONHeader.Add("Content-Type", "application/json")
 
-	server.SetAllowUnhandledRequests(false)
+	server.SetAllowUnhandledRequests(true)
 
 	server.RouteToHandler(
 		http.MethodGet,