Datasource and Undertow transformer tests have bugs that are revealed when WFCORE-3259 is fixed

UndertowTransformersTestCase isn't setting up the AdditionalInitialization on the legacy controller side so the boot ops fail due to missing capabilities.

DatasourcesSubsystemTestCase in one test is using a config with an enum value the legacy hosts can't understand, and in another it's not correcting a rejected value causing the test to fail when it continues.

Simple fixes, although the undertow one has revealed issues in how core deals with legacy controllers that will have to be corrected before the tests can pass.