consider behavior when using debug endpoints

[marc0olo]

we should check what happens in our services if debug endpoint is disabled but we explicitely try to call a debug endpoint.

e.g. for dryRun (internal, not public protected) or checkTxInPool

does it make sense to isolate those service methods into a dedicated service? I don't think so at the moment

probably it's best and easiest way to introduce an exception like DebugModeNotEnabledException in all of those cases