Add exact correlation ID assertion alongside UUID format validation in IMDS test

Agent-Logs-Url: https://github.com/AzureAD/microsoft-authentication-library-for-java/sessions/a002e01d-801c-4ba9-8cf4-0d0ad3b9a0c9

Co-authored-by: gladjohn <90415114+gladjohn@users.noreply.github.com>

Author: Copilot

msal4j-sdk/src/test/java/com/microsoft/aad/msal4j/ManagedIdentityTests.java

@@ -707,6 +707,7 @@ void managedIdentityTest_RetrySucceedsAfterFailure() throws Exception {
             HttpRequest capturedRequest = captor.getValue();
             assertEquals(EXPECTED_SKU, capturedRequest.headers().get("x-client-SKU"));
             assertNotNull(capturedRequest.headers().get("x-client-VER"));
+            assertEquals(TEST_CORRELATION_ID, capturedRequest.headers().get("x-ms-client-request-id"));
             assertDoesNotThrow(() -> UUID.fromString(capturedRequest.headers().get("x-ms-client-request-id")));
         }