Updated MaterialPropertyId class in preparation for nested material property sets.

Here the class has been generalized for a list of group names and a final property name, rather than assuming a single group containing the property. This included removing the unused GetPropertyName and GetGroupName functions. All that's really need from this class is conversion to a full property ID string.

Testing:
New unit test.
Reprocessed all core material types and StandardPBR test materials used in Atom Sample Viewer's material screenshot test.
Atom Sample Viewer material screenshot test script.

Signed-off-by: santorac <55155825+santorac@users.noreply.github.com>

Gems/AtomLyIntegration/CommonFeatures/Code/Source/Material/EditorMaterialComponentInspector.cpp

@@ -310,7 +310,7 @@ namespace AZ
                             AtomToolsFramework::DynamicPropertyConfig propertyConfig;
 
                             // Assign id before conversion so it can be used in dynamic description
-                            propertyConfig.m_id = AZ::RPI::MaterialPropertyId(groupName, propertyDefinition.m_name).GetFullName();
+                            propertyConfig.m_id = AZ::RPI::MaterialPropertyId(groupName, propertyDefinition.m_name);
 
                             AtomToolsFramework::ConvertToPropertyConfig(propertyConfig, propertyDefinition);