Revert "Support for multiple @key directives in federation" #1698
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Reverts #1684
@carldunham We found that this has been causing a number of problems that were not well covered with existing tests. We are going add more tests, which highlight some of the issues. We would still very much like to have this feature, but it's not obvious how to solve it without causing these problems so we think it needs a little more work. Please see #1697 for more details