[fix] skip all-but standalone assign on SetTypeToCastRector #32713

Job	Run time
End to end test - e2e/applied-rule-change-docblock	16s
End to end test - e2e/applied-rule-removed-node	19s
End to end test - e2e/different-path-over-skip-config	18s
End to end test - e2e/applied-auto-import	19s
End to end test - e2e/applied-rule-return-array-nodes	19s
End to end test - e2e/applied-polyfill-php80	20s
End to end test - e2e/only-option	17s
End to end test - e2e/parallel with space	20s
End to end test - e2e/only-option-quote-double-equalnone	25s
End to end test - e2e/parallel-custom-config	19s
End to end test - e2e/invalid-paths	14s
End to end test - e2e/only-option-quote-single	19s
End to end test - e2e/no-parallel-reflection-resolver	16s
End to end test - e2e/print-new-node	17s
End to end test - e2e/parallel-reflection-resolver	20s
End to end test - e2e/only-option-quote-single-equalnone	15s
End to end test - e2e/only-option-quote-single-bsdouble	17s
	5m 10s

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