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Rationale

TroubleshooterRole doesn't grant read permissions in the root. That causes multiple problems, particularly viewing admin queries and interacting with those grids. This gives the role read permission restricted to the root. More details; https://github.com/LabKey/internal-issues/issues/785

Separate, but related, many SecurityPolicy methods iterate roles and permissions in a policy associated with a set of principals, populate these objects into a HashSet, and return the collection... only for callers to immediately convert the collection to a stream or simply test for the existence of a single role or permission. Reworking these key methods to return Streams provides convenience and avoids creating, discarding, and garbage collecting unnecessary collections in these frequently used code paths. It also allows for short-circuiting in the existence cases, since the iteration process can cease soon as the desired role or permission is seen.

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