This PR fixes 2 issues discovered around PolicyUtils (and PolicyUtilsTests) when running CI on Windows:
- in tests, absolute paths like always are different, this fix updates the tests to account for the difference.
- on Windows, Files.move was failing because we were parsing the Entitlement policy but not closing the stream in a timely manner. This causes plugin installation (and related CI tests) to fail 70% of the time. Fixed by closing the stream properly
Fixes#126176