Description of problem:

It is not possible to configure dynamic-plugins.yaml to ignore includes defined in default-config/dynamic-plugins.yaml  

Prerequisites (if any, like setup, operators/versions):

Steps to Reproduce

Configure Backstage CR with spec.application.dynamicPluginsConfigMapName

Configure dynamic-plugins ConfigMap with dynamic-plugins.yaml: []

Actual results:

All the enabled default dynamic plugins are included as default-config/dynamic-plugins.yaml contains "includes: dynamic-plugins.default.yaml"

Expected results:

No plugins included 

Reproducibility (Always/Intermittent/Only Once):

Always