[2024-04] Everyone: review existing and submit additional test-cases

[benjie]

[ACTION] - everyone: Please look at the rfcs/test-cases folder in the composite-schemas-spec repository (and add the ones missing)

• assignee(s): everyone (champion @michaelstaib)
• source: https://github.com/graphql/composite-schemas-wg/blob/main/notes/2024/2024-04.md

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