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[java] CognitiveComplexity: count switch expressions (#6883)

* [java] CognitiveComplexity: count switch expressions

CognitiveComplexityVisitor handled ASTSwitchStatement but not
ASTSwitchExpression, so a switch expression received no structural
increment and opened no nesting level. Anything nested inside it also
lost its nesting increment, and the metric came out too low.

Add visit(ASTSwitchExpression), delegating to the same structural()
helper the switch statement uses, so both forms are scored the same way.
CycloVisitor in the same package already handles both through the common
ASTSwitchLike supertype.

Fixes #6881

* Add github issue number

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Co-authored-by: Sören Glimm <git@uncleowen.de>

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