fix: Trigger NoLiveMixedWithDeferStreamRule only if query has @live directive

[aarne]

Some queries with fragments marked with @defer would trigger this error without actually having @live directive in the query

example query:

{
  containers {
    id
    ...TriggerError
  }
}

fragment TriggerError on Container {
  id
  ... on Container @defer {
    stats
  }
}

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[n1ru4l]

@aarne can you please add a test case for this change?