It seems the `c2id/c2id-server` docker image has dissappeared from DockerHub so our idp-fixture that depends on it can no longer start. This is currently only required by our `oidc-op-tests` project so for now I've disabled these tests. We'll need to find an alternative fixture here. I tried simply replacing it with the `c2id-server-demo` image but it wasn't a direct replacement.

https://gradle-enterprise.elastic.co/s/p4vwhzkudvutw
x-pack/qa/oidc-op-tests/src/javaRestTest/java/org/elasticsearch/xpack/security/authc/oidc/C2IdOpTestCase.java
{"qs":"%s"}
                """.formatted(opAuthUri.getRawQuery());
            configureJsonRequest(httpPost, initJson);
            JSONObject initResponse = execute(httpClient, httpPost, context, response -> {
                assertHttpOk(response.getStatusLine());
                return parseJsonResponse(response);
            });
            assertThat(initResponse.getAsString("type"), equalTo("auth"));
            final String sid = initResponse.getAsString("sid");
            
            HttpPost loginHttpPost = new HttpPost(C2ID_LOGIN_API + "authenticateSubject?cacheBuster=" + randomAlphaOfLength(8));
            String loginJson = """
                {"username":"alice","password":"secret"}""";
            configureJsonRequest(loginHttpPost, loginJson);
            JSONObject loginJsonResponse = execute(httpClient, loginHttpPost, context, response -> {
                assertHttpOk(response.getStatusLine());
                return parseJsonResponse(response);
            });
            
            HttpPut consentFetchHttpPut = new HttpPut(
                C2ID_LOGIN_API + "updateAuthRequest" + "/" + sid + "?cacheBuster=" + randomAlphaOfLength(8)
            );
            String consentFetchJson = """
                {
                  "sub": "%s",
                  "acr": "http://loa.c2id.com/basic",
                  "amr": [ "pwd" ],
                  "data": {
                    "email": "%s",
                    "name": "%s"