Enforce JLS §14.11.1 language-level rules for multi-pattern case labels#5010
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Multiple patterns per case label (case A _, B _ ->) were introduced in
Java 22 (JEP 456). Two validation rules are added to enforce the spec:
labels below Java 22, since the feature did not exist before.
that combines multiple patterns where at least one declares a named
pattern variable (e.g. case String s, Integer _ ->), as required by
JLS §14.11.1.
Test cases cover all four scenarios: valid unnamed patterns, rejection
below Java 22, and the two named-variable violations.