Convert automated tests related to content and unused levels (#7416)

* Convert automated tests related to content/WaterSample level/Physics's Base level

Signed-off-by: chiyenteng <82238204+chiyenteng@users.noreply.github.com>

* Fix nits

Signed-off-by: chiyenteng <82238204+chiyenteng@users.noreply.github.com>

* Add missing .prefab level file

Signed-off-by: chiyenteng <82238204+chiyenteng@users.noreply.github.com>

* Fix nits

Signed-off-by: chiyenteng <82238204+chiyenteng@users.noreply.github.com>

* Convert Blast tests

Signed-off-by: chiyenteng <82238204+chiyenteng@users.noreply.github.com>

* Convert scripting tests

Signed-off-by: chiyenteng <82238204+chiyenteng@users.noreply.github.com>

* Remove useless comments

Signed-off-by: chiyenteng <82238204+chiyenteng@users.noreply.github.com>

* Revert Collider_AddColliderComponent change until prefab error message bug fixed

Signed-off-by: chiyenteng <82238204+chiyenteng@users.noreply.github.com>

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

@@ -57,6 +57,8 @@ def Material_LibraryClearingAssignsDefault():
     from editor_python_test_tools.utils import TestHelper as helper
     from editor_python_test_tools.asset_utils import Asset
 
+    import editor_python_test_tools.hydra_editor_utils as hydra
+
     # Open 3D Engine Imports
     import azlmbr.asset as azasset
 
@@ -66,9 +68,8 @@ def Material_LibraryClearingAssignsDefault():
     default_material_path = os.path.join("assets", "physics", "surfacetypemateriallibrary.physmaterial")
     new_material_path = os.path.join("physicssurfaces", "default_phys_materials.physmaterial")
 
-    helper.init_idle()
     # 1) Load the level
-    helper.open_level("Physics", "Base")
+    hydra.open_base_level()
 
     # 2) Create new Entity with PhysX Character Controller
     test_entity = EditorEntity.create_editor_entity("TestEntity")