Module input configuration merge should handle duplicates

[mkam]

Description

The merge function for module inputs does not take into account whether there are duplicate module inputs across the two configs that are merging. There should be no duplicates in the merged list of module inputs.

Additional context

• CTS currently only allows one type of module input per task, but in the future it may allow multiple types, which is why it is stored as a list and not a map.
• For service module inputs, order should be ignored for the service names list. If the contents of the list are the same, then it is a duplicate.
• Related bug, which will be solved with a short term fix to remove calling the merge: Module inputs duplicated in state store #979