[CLEAN] Synthetic Benchmark PR #19282 - add option to disable the Kubernetes worker observer and pod event replication

[ofir-frd]

Benchmark PR PrefectHQ#19282

Type: Clean (correct implementation)

Original PR Title: add option to disable the Kubernetes worker observer and pod event replication
Original PR Description:

Partially addresses PrefectHQ#19026

This change makes it easier to run the observer and worker as separate deployments by allowing to disable the observer. Additionally, it adds a setting to disable the pod event replication as that can cause very high CPU usage.

Checklist

• This pull request references any related issue by including "closes <link to issue>"
  • If no issue exists and your change is not a small fix, please create an issue first.
• If this pull request adds new functionality, it includes unit tests that cover the changes
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Original PR URL: PrefectHQ#19282