Refine switch cases

[Jenson3210]

What's changed?

Cutting up the task at hand in multiple smaller PR's for better insights, risk assessment...

• RefineSwitchCases

What's your motivation?

• Pattern Matching for switch in Java 21 / JEP 411 #306

Anything in particular you'd like reviewers to focus on?

Anyone you would like to review specifically?

Have you considered any alternatives or workarounds?

Any additional context

Checklist

• I've added unit tests to cover both positive and negative cases
• I've read and applied the recipe conventions and best practices
• I've used the IntelliJ IDEA auto-formatter on affected files

[Jenson3210]

@timtebeek would you want any further review? Or can I go ahead and do the necessary to merge (adapt the declarative yaml)

[timtebeek]

Great to see, thanks! I've applied some small changes & fixes, mostly to avoid problems with already guarded cases or unexpected elements in conditionals, and to keep the formatting as close to the original as it was by taking out explicitly overridden whitespace:
def387f...093b16d

I've also ran this against Apache locally using the CLI, but did not see any changes there. We can try again using the platform after this is merged and deployed.

[timtebeek]

Ran at scale and found some slight imperfections; fixed with ed6194c and figured share that here in case it applies to the others as well.