docs: add recommended labels example for production workloads

[allexistence]

Description

Adds a recommended example demonstrating the use of the standard app.kubernetes.io/* label set for production and platform-managed workloads.

This improves the "Using labels effectively" section by providing practical guidance on consistent labeling conventions that help with workload identification, observability, and platform operations across Kubernetes environments.

Issue

Closes: N/A

[linux-foundation-easycla]

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