fix compatibility test error (Azure#29537)

Author: saragluna

sdk/spring/spring-cloud-azure-autoconfigure/src/test/java/com/azure/spring/cloud/autoconfigure/AbstractAzureServiceConfigurationTests.java

@@ -98,7 +98,7 @@ private <C> void assertSovereignCloudsSetInCredential(AssertableApplicationConte
         AzureTokenCredentialResolver tokenCredentialResolver = getAzureTokenCredentialResolver(builderFactory);
 
         TokenCredential tokenCredential = tokenCredentialResolver.resolve(properties);
-        Assertions.assertInstanceOf(credentialType, tokenCredential);
+        Assertions.assertTrue(credentialType.isAssignableFrom(tokenCredential.getClass()));
 
         IdentityClient identityClient = getIdentityClient(tokenCredential);
         Assertions.assertEquals(AzureAuthorityHosts.AZURE_GOVERNMENT, identityClient.getIdentityClientOptions().getAuthorityHost());