Draft: Resolve "config: activation_deadline new parameter in config yaml"

Summary

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• Close #489 (closed)

• Cherry-pick to: 25.1, 24.6

• Staging:

  • https://docs.binary.picodata.io/picodata/vbabayan/489-config-activation_deadline-new-parameter-in-config-yaml/

• Follow-up for picodata!1736 (merged)

Closes #489 (closed)