R1:40d3bcb8910b

Fix a complicated object caching issue with the policy filter

Summary:
Fixes T11853. To set this up:

- Create "Project A".
- Join "Project A".
- Create a subproject, "Project A Subproject 1".
- This causes Project A to become a parent project.
- This moves you to be a member of "Project A Subproject 1" instead of "Project A" directly.
- Create another subproject, "Project A Subproject 2".
- Do not join this subproject.
- Set the second subproject's policy to "Visible To: Members of…