PSS opt-out override: move logic to MediaProjectionManager

Relanding PSS opt-out override from ag/25896593. Initial implementation defined the ChangeId on SysUI side, but SysUI tests seemed to not recognise it being disabled by default, leading to SysUI test failures. Now instead defining the ChangeId in MediaaProjectionmanager, SysUI is able to properly to read the override as disabled by default, so shouldn't break existing SysUI E2Es.

Bug: 316897322
Flag: None
Test: atest packages/SystemUI/tests/src/com/android/systemui/mediaprojection/permission/MediaProjectionPermissionDialogDelegateTest.kt
Test: atest packages/SystemUI/tests/src/com/android/systemui/screenrecord/ScreenRecordPermissionDialogDelegateTest.kt
Test: atest CtsMediaProjectionTestCases:MediaProjectionCompatChangeTests
Test: atest PlatformScenarioTests:android.platform.test.scenario.sysui.mediaprojection.MediaProjectionPermissionTest
Change-Id: Ibb9ec963a094ab384980bcbd58c68a39d6094ef2