Fixed physics periodic tests on linux platform (#6881)

- Fixed path separators, now levels will be correctly opened in linux.
- Fixed casing of physics paths.
- Fixed casing of files inside levels Joints_HingeNoLimitsConstrained and RigidBody_KinematicModeWorks.
- Resaved a level that still used old test ids in its name but the python tests didn't match.

Linux:
     Start 21: AutomatedTesting::PhysicsTests_Periodic.periodic::TEST_RUN
8/11 Test #21: AutomatedTesting::PhysicsTests_Periodic.periodic::TEST_RUN ..................   Passed  609.87 sec

Windows:
     Start 21: AutomatedTesting::PhysicsTests_Periodic.periodic::TEST_RUN
8/13 Test #21: AutomatedTesting::PhysicsTests_Periodic.periodic::TEST_RUN .......................   Passed  810.59 sec

Signed-off-by: moraaar <moraaar@amazon.com>

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