Correctly Set Up EditorManager on New Workspaces

[thecoolwinter]

Description

Adjusts the setup of EditorManager to always assign the workspace property on all editors after restoring it. This creates duplicate work when we have editors that successfully restore from a saved state, but ensures we always set up the editor manager correctly even when an error is thrown or there is no restoration data.

Adjusted UI tests to catch this.

Related Issues

• Issue on discord.

Checklist

• I read and understood the contributing guide as well as the code of conduct
• The issues this PR addresses are related to each other
• My changes generate no new warnings
• My code builds and runs on my machine
• My changes are all related to the related issue above
• I documented my code

Screenshots

N/A