docs: replace deprecated commonLabels in examples

[locker95]

commonLabels warns to use labels instead. The helloWorld base and demo overlays (and the breakfast tutorial) still used the old field, so following them always trips that deprecation.

Switched those examples to labels with includeSelectors: true, which matches the old commonLabels behavior.

Fixes #5653

[kubernetes-prow]

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[saitejabandaru-in]

LGTM! This perfectly migrates the deprecated commonLabels to the new labels field in the examples. Great cleanup!

[kubernetes-prow]

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