Add orchestrator label.

[davinchia]

What

Add the orchestrator label to orchestrators so we can better differentiate orchestrator pods.

This is useful since orchestrator pods are the only pods in the job namespace with a need to talk to the main Airbyte application pods. These labels allow us to apply more granular network filtering.

Also took the chance to do some clean up of labels.

How

• Add the ORCHESTRATOR_STEP label to the LauncherWorker. All orchestrator pods will have this label applied.
• Move all process related metadata e.g. labels, naming etc into a Metadata class for better code design.

Recommended reading order

1. Metadata.java
2. Everything else.

🚨 User Impact 🚨

Are there any breaking changes? What is the end result perceived by the user? If yes, please merge this PR with the 🚨🚨 emoji so changelog authors can further highlight this if needed.

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[jdpgrailsdev]

One minor nit about the constants class.

[pedroslopez]

Nice!