[Fusion] Fixed duplicated selections

[tobias-tengler]

Fixes #7687

[tobias-tengler]

Just noticed another issue that has also existed previously: Selections on interfaces are inlined into object type selections, but not explicitly forwarded to subgraphs.

Original query:

communityItems(first: 3) {
  nodes {
    __typename
    ... on CommunityDiscussion {
      databaseId
    }
    ... on ProductQuestion {
      databaseId
    }
    ... on ProductReview {
      databaseId
    }
    ... on Node {
      __isNode: __typename
      id
    }
  }
}

Subgraph query:

communityItems(first: 3) {
  nodes {
    __typename
    ... on CommunityDiscussion {
      __typename
      databaseId
      __isNode: __typename
      id
    }
    ... on ProductQuestion {
      __typename
      databaseId
      __isNode: __typename
      id
    }
    ... on ProductReview {
      __typename
      databaseId
      __isNode: __typename
      id
    }
  }
}

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 74.00%. Comparing base (02b1ca8) to head (1121c64).
Report is 34 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #7677      +/-   ##
==========================================
+ Coverage   73.95%   74.00%   +0.05%     
==========================================
  Files        2917     2918       +1     
  Lines      151116   151252     +136     
  Branches    17560    17576      +16     
==========================================
+ Hits       111753   111936     +183     
+ Misses      33507    33465      -42     
+ Partials     5856     5851       -5     

Flag	Coverage Δ
unittests	74.00% <ø> (+0.05%)	⬆️

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