Add projectSettingsUpdate mutation

What does this MR do and why?

Add mutations / graphql to interact with new duo_features_enabled setting.

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How to set up and validate locally

1. Execute mutation on a test project

mutation test {
  projectSettingsUpdate(input:{fullPath: TESTPATH, duoFeaturesEnabled: true}) {
    errors
  }
}

2. Query the result of that setting

query project {
  project(fullPath: TESTPATH) {
  	duoFeaturesEnabled    
  }
}

Resolves #440485 (closed)