Fix #5030: [java] SwitchDensity false positive with pattern matching

[adangel]

Describe the PR

I only added the isPatternLabel() method as we don't need getPattern() or getGuard() yet.

The rule already supported switch expressions, btw.

Related issues

• Fixes [java] SwitchDensity false positive with pattern matching #5030

Ready?

• Added unit tests for fixed bug/feature
• Passing all unit tests
• Complete build ./mvnw clean verify passes (checked automatically by github actions)
• Added (in-code) documentation (if needed)

[ghost]

	1 Message
📖	Compared to main: This changeset changes 500 violations, introduces 0 new violations, 0 new errors and 0 new configuration errors, removes 1 violations, 0 errors and 0 configuration errors. Download full report as build artifact
✅	Compared to main: This changeset changes 0 violations, introduces 0 new violations, 0 new errors and 0 new configuration errors, removes 1 violations, 0 errors and 0 configuration errors. Download full report as build artifact
✅	Compared to main: This changeset changes 0 violations, introduces 0 new violations, 0 new errors and 0 new configuration errors, removes 1 violations, 0 errors and 0 configuration errors. Download full report as build artifact

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