[tests] add known iterator return types #31427

Job	Run time
End to end test - e2e/applied-polyfill-php80	26s
End to end test - e2e/applied-auto-import	18s
End to end test - e2e/applied-rule-change-docblock	15s
End to end test - e2e/applied-rule-return-array-nodes	20s
End to end test - e2e/applied-rule-removed-node	20s
End to end test - e2e/different-path-over-skip-config	20s
End to end test - e2e/no-parallel-reflection-resolver	20s
End to end test - e2e/invalid-paths	18s
End to end test - e2e/only-option-quote-single	34s
End to end test - e2e/parallel-kaizen-applied-rules	21s
End to end test - e2e/parallel-custom-config	23s
End to end test - e2e/only-option-quote-double-equalnone	23s
End to end test - e2e/only-option	20s
End to end test - e2e/print-new-node	18s
End to end test - e2e/only-option-quote-single-bsdouble	21s
End to end test - e2e/only-option-quote-single-equalnone	24s
End to end test - e2e/parallel with space	16s
End to end test - e2e/parallel-reflection-resolver	27s
	6m 24s

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