Re-add some PrivateSpaceMaintainer tests that were fixed by ag/32740562

We started ignoring these due to presubmit failures in b/378392936. They
are fixed due to ag/32740562 that updated the UserManager apis used in
PrivateSpaceMaintainer

Bug: 394024903
Test: atest PrivateSpaceMaintainerTest
Flag: EXEMPT test changes
Change-Id: Ia8f9dd99feffa415cf167ff9cf8dbde12ef56eb0