create new policy for palace invite updates

[dreamfall]

📝 A short description of the changes

• when trying to edit and then save the palace invite I get the 'LS is already defined' error and the UI breaks

🔗 Link to the relevant story (or stories)

• ID 16 https://docs.google.com/spreadsheets/d/1ND1sISLYLwfWZX9DfKx5e4Vq4zIwxtB7dURhZNMZflk/edit#gid=1625100881
• https://app.asana.com/0/1200504523179345/1204412218516929/f

✅ Checklist

• Features that cannot go live are behind a feature flag/env var or specify deploy date and open PR as draft
• I have checked that commit messages make sense and explain the reasoning for each change
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have added tests that prove my fix is effective or that my feature works
• I have squashed any unnecessary or part-finished commits