Expose licensed features in the Namespace GraphQL type

What does this MR do and why?

This MR introduces the licensed_features field on the namespace GQL type, to facilitate reading these values from the frontend when work items are opened from the drawer

References

• #537149 (closed)

Screenshots or screen recordings

Not provided

How to set up and validate locally

1. In an environment with the GDK running, navigate to http://localhost:3000/-/graphql-explorer
2. Run a query on a group namespace to fetch the appropriate fields. e.g:

query q {
  namespace(fullPath: "flightjs") {
    licensedFeatures {
      hasIssueWeightsFeature
      hasIterationsFeature
      hasOkrsFeature
      hasSubepicsFeature
      hasIssuableHealthStatusFeature
      hasEpicsFeature
      hasScopedLabelsFeature
      hasQualityManagementFeature
      hasLinkedItemsEpicsFeature
      hasIssueDateFilterFeature
    }
  }
}

3. Observe that the values returned match the state of the license
4. Repeat the above with a project namespace and user namespace

MR acceptance checklist

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Related to #537149 (closed)