Updating ReplaceDuplicateStringLiterals recipe to use VariableNameUtils to track variable names #377
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VariableNameUtils already provides a list of used names in the scope :). We need to handle some edges slightly different
1: When the constant already exists, in this case by default this existing constant name wouldn't be used because it's already being used. In this case, we need to allow the recipe to use this variable
2: We want to prevent namespace shadowing on existing constants (preventNamespaceShadowingOnExistingConstant is the associated test). When we solve edge 1, by allowing existing constants to be used, we break this edge case. As such we need to validate that we are assigning a name to the value which makes sense.