It's possible to publish nodes in unpublished folders

As tested on demo.getmesh.io with Gentics Mesh 1.5.3: it is currently possible to publish nodes in a folder that are not yet published themselves. This should not be allowed (and there is a test that should guarantee that: https://github.com/gentics/mesh/blob/980796e385880de2607375e82ffb9efd06b7daa4/core/src/test/java/com/gentics/mesh/core/node/NodePublishEndpointTest.java#L57 )

Start with core/src/test/java/com/gentics/mesh/core/node/NodePublishEndpointTest.java around line 57 and reproduce the unpublished-folder case against the node publish endpoint. Trace the endpoint behavior and ensure a node cannot be published while its containing folder remains unpublished, with the referenced test passing.

Written by the indexing model from the issue text.