Environment Variables need to be expanded before checking if valid option in component inputs

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Problem

When a user defines an input with options, e.g.:

spec:
  inputs:
    a:
      options: 
        - foo
        - bar

and when setting it to the value of a variable, e.g.:

include:
  - component: ...
    inputs:
      a: $VALUE_OF_A

it fails because the literal value $VALUE_OF_A is not a valid option - that is, neither foo nor bar. Even if VALUE_OF_A=foo.