### Description

In [TransportSamlInitiateSingleSignOnActionTests.java](https://github.com/elastic/elasticsearch/pull/98882/files#diff-26733d11b06442213a040cc3d5c89595300ec813bb31076874afa38ef2ad3b91),  `/api/security/v1/saml` (deprecated) should be replaced with /api/security/saml/callback

In https://github.com/elastic/kibana/blob/b33effa182bcb7c9620c5435ab252d8067732655/x-pack/plugins/security/server/routes/authentication/saml.ts#L27

/api/security/saml/callback is the correct URL,
while /api/security/v1/saml is the deprecated URL.

Related to https://github.com/elastic/cloud-on-k8s/issues/7118
x-pack/plugin/identity-provider/src/test/java/org/elasticsearch/xpack/idp/action/TransportSamlInitiateSingleSignOnActionTests.java
import java.util.Collections;
import java.util.HashMap;
import java.util.Set;
import static org.hamcrest.CoreMatchers.containsString;
import static org.hamcrest.CoreMatchers.equalTo;
import static org.hamcrest.Matchers.arrayWithSize;
import static org.mockito.ArgumentMatchers.any;
import static org.mockito.ArgumentMatchers.nullable;
import static org.mockito.Mockito.doAnswer;
import static org.mockito.Mockito.mock;
import static org.mockito.Mockito.when;
import static org.opensaml.saml.saml2.core.NameIDType.TRANSIENT;
public class TransportSamlInitiateSingleSignOnActionTests extends IdpSamlTestCase {
    public void testGetResponseForRegisteredSp() throws Exception {
        final SamlInitiateSingleSignOnRequest request = new SamlInitiateSingleSignOnRequest();
        request.setSpEntityId("https://sp.some.org");
        request.setAssertionConsumerService("https://sp.some.org/api/security/v1/saml");
        final PlainActionFuture<SamlInitiateSingleSignOnResponse> future = new PlainActionFuture<>();
        final TransportSamlInitiateSingleSignOnAction action = setupTransportAction(true);
        action.doExecute(mock(Task.class), request, future);
        final SamlInitiateSingleSignOnResponse response = future.get();
        assertThat(response.getEntityId(), equalTo("https://sp.some.org"));
        assertThat(response.getPostUrl(), equalTo("https://sp.some.org/api/security/v1/saml"));
        assertThat(response.getSamlResponse(), containsString(TRANSIENT));
        assertContainsAttributeWithValue(response.getSamlResponse(), "email", "samlenduser@elastic.co");
        assertContainsAttributeWithValue(response.getSamlResponse(), "name", "Saml Enduser");
        assertContainsAttributeWithValue(response.getSamlResponse(), "principal", "saml_enduser");
        assertThat(response.getSamlResponse(), containsString("https://saml.elasticsearch.org/attributes/roles"));
    }
    public void testGetResponseWithoutSecondaryAuthenticationInIdpInitiated() throws Exception {