[tests] add known iterator return types #31428

Job	Run time
End to end test - e2e/applied-rule-removed-node	25s
End to end test - e2e/different-path-over-skip-config	17s
End to end test - e2e/applied-auto-import	17s
End to end test - e2e/applied-rule-change-docblock	18s
End to end test - e2e/no-parallel-reflection-resolver	18s
End to end test - e2e/applied-rule-return-array-nodes	15s
End to end test - e2e/applied-polyfill-php80	27s
End to end test - e2e/only-option-quote-double-equalnone	22s
End to end test - e2e/only-option-quote-single-bsdouble	21s
End to end test - e2e/only-option	22s
End to end test - e2e/invalid-paths	19s
End to end test - e2e/parallel-kaizen-applied-rules	19s
End to end test - e2e/parallel-custom-config	18s
End to end test - e2e/parallel-reflection-resolver	21s
End to end test - e2e/only-option-quote-single-equalnone	22s
End to end test - e2e/only-option-quote-single	16s
End to end test - e2e/print-new-node	22s
End to end test - e2e/parallel with space	22s
	6m 1s

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