Remove flakyness in BugreportManagerServiceImplTest.

Changes to RoleManager are persisting between test runs (changes must be stored statically).

Ran BugreportManagerServiceImplTest 100 times with no flakes.

Change-Id: Ic65ad65ad595c4452bd6c063e3faa9f4ad2ecc9a
Bug: 282715698
1 file changed