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
httpPost.setHeader("Accept", "application/json");
                httpPost.setHeader("Content-type", "application/json");
                httpPost.setHeader("Authorization", "Bearer " + OP_API_BEARER_TOKEN);
                requests.add(httpPost);
            }
            SocketAccess.doPrivileged(() -> {
                for (HttpPost httpPost : requests) {
                    try (CloseableHttpResponse response = httpClient.execute(httpPost, context)) {
                        assertThat(response.getStatusLine().getStatusCode(), equalTo(201));
                    }
                }
            });
        }
    }
    @Override
    protected Settings restAdminSettings() {
        String token = basicAuthHeaderValue("x_pack_rest_user", new SecureString("x-pack-test-password".toCharArray()));
        return Settings.builder()
            .put(ThreadContext.PREFIX + ".Authorization", token)
            .put(CERTIFICATE_AUTHORITIES, HTTP_TRUSTED_CERT)
            .build();
    }
    protected String authenticateAtOP(URI opAuthUri) throws Exception {
        
        
        try (CloseableHttpClient httpClient = HttpClients.createDefault()) {
            final BasicHttpContext context = new BasicHttpContext();
            
            HttpPost httpPost = new HttpPost(C2ID_LOGIN_API + "initAuthRequest");
            String initJson = """