allow result features to be removed by raw feature filter

[leahmcguire]

Related issues Result features removed by raw feature filter throw an error, but sometimes we wish to allow them to be removed.

Describe the proposed solution Created a flag that allows removal of result features by raw feature filter

Describe alternatives you've considered A clear and concise description of any alternative solutions or features you've considered.

Additional context Add any other context about the changes here.

[codecov[bot]]

Codecov Report

:exclamation: No coverage uploaded for pull request base (master@df160d5). Click here to learn what that means. The diff coverage is 98.07%.

@@            Coverage Diff            @@
##             master     #458   +/-   ##
=========================================
  Coverage          ?   86.95%           
=========================================
  Files             ?      340           
  Lines             ?    11428           
  Branches          ?      363           
=========================================
  Hits              ?     9937           
  Misses            ?     1491           
  Partials          ?        0

Impacted Files	Coverage Δ
...e/op/stages/impl/feature/SmartTextVectorizer.scala	95.61% <ø> (ø)
...s/impl/feature/OPCollectionHashingVectorizer.scala	96.55% <100%> (ø)
.../src/main/scala/com/salesforce/op/OpWorkflow.scala	88.96% <100%> (ø)
...p/stages/impl/feature/SmartTextMapVectorizer.scala	100% <100%> (ø)
...scala/com/salesforce/op/features/types/Lists.scala	75% <66.66%> (ø)

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