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>

AutomatedTesting/Gem/PythonTests/Physics/tests/collider/Collider_SameCollisionGroupSameCustomLayerCollide.py

@@ -127,7 +127,7 @@ def Collider_SameCollisionGroupSameCustomLayerCollide():
     # Main Script
     # 1) Load the level
     helper.init_idle()
-    helper.open_level("physics", "Collider_SameCollisionGroupSameCustomLayerCollide")
+    helper.open_level("Physics", "Collider_SameCollisionGroupSameCustomLayerCollide")
 
     # 2) Enter Game Mode
     helper.enter_game_mode(Tests.enter_game_mode)

AutomatedTesting/Gem/PythonTests/Physics/tests/force_region/ForceRegion_MultipleForcesInSameComponentCombineForces.py

@@ -162,7 +162,7 @@ def ForceRegion_MultipleForcesInSameComponentCombineForces():
     helper.init_idle()
 
     # 1) Load Level
-    helper.open_level("physics", "ForceRegion_MultipleForcesInSameComponentCombineForces")
+    helper.open_level("Physics", "ForceRegion_MultipleForcesInSameComponentCombineForces")
 
     # 2) Enter Game Mode
     helper.enter_game_mode(Tests.enter_game_mode)

AutomatedTesting/Gem/PythonTests/Physics/tests/material/Material_DefaultLibraryUpdatedAcrossLevels_after.py

@@ -229,8 +229,8 @@ def Material_DefaultLibraryUpdatedAcrossLevels_after():
     for test in test_list:
         # 1) Open the correct level is open
         helper.open_level(
-            "physics",
-            f"Material_DefaultLibraryUpdatedAcrossLevels\\{test.level}"
+            "Physics",
+            os.path.join("Material_DefaultLibraryUpdatedAcrossLevels", str(test.level))
         )
 
         # 2) Enter Game Mode

AutomatedTesting/Gem/PythonTests/Physics/tests/material/Material_DefaultLibraryUpdatedAcrossLevels_before.py

@@ -189,7 +189,7 @@ def Material_DefaultLibraryUpdatedAcrossLevels_before():
         # 1) Open the correct level is open
         helper.open_level(
             "Physics",
-            f"Material_DefaultLibraryUpdatedAcrossLevels\\{test.level}"
+            os.path.join("Material_DefaultLibraryUpdatedAcrossLevels", str(test.level))
         )
 
         # 2) Enter Game Mode

AutomatedTesting/Gem/PythonTests/Physics/tests/material/Material_LibraryUpdatedAcrossLevels.py

@@ -252,10 +252,8 @@ def Material_LibraryUpdatedAcrossLevels():
     for test in test_list:
         # 1) Open the correct level for the test
         helper.open_level(
-            "physics",
-            "Material_LibraryUpdatedAcrossLevels\\Material_LibraryUpdatedAcrossLevels_{}".format(
-                test.level_index
-            ),
+            "Physics",
+            os.path.join("Material_LibraryUpdatedAcrossLevels", str(test.level_index))
         )
 
         # 2) Open Game Mode

AutomatedTesting/Gem/PythonTests/Physics/tests/script_canvas/ScriptCanvas_SpawnEntityWithPhysComponents.py

@@ -106,7 +106,7 @@ def ScriptCanvas_SpawnEntityWithPhysComponents():
     # Main Script
     helper.init_idle()
     # 1) Open Level
-    helper.open_level("physics", "ScriptCanvas_SpawnEntityWithPhysComponents")
+    helper.open_level("Physics", "ScriptCanvas_SpawnEntityWithPhysComponents")
 
     # 2) Enter Game Mode
     helper.enter_game_mode(Tests.enter_game_mode)