BUGFIX: Find nodes marked as removed in other dimension

[beromir]

If you delete a node in a workspace that has already been deleted in the workspace in another dimension, the node is not marked as removed in the database.

With this PR, nodes marked as removed are also found in non-live workspaces.

related: #5031

Checklist

• Code follows the PSR-2 coding style
• Tests have been created, run and adjusted as needed
• The PR is created against the lowest maintained branch
• Reviewer - PR Title is brief but complete and starts with FEATURE|TASK|BUGFIX
• Reviewer - The first section explains the change briefly for change-logs
• Reviewer - Breaking Changes are marked with !!! and have upgrade-instructions

[dlubitz]

Thank you very much. I've tested that and it seems to make totally sense.

As I missed it in first place: This is an issue due to baseworkspace hierarchy. The first removal ends up as an unpublished change in the base workspace. The fix ensures, that we will find this change and recognize this node as "existing". So we need the shadow node for our dependent workspace, to make this second deletion publishable in our current workspace.