feat(api-service): SDK test updates

[tatarco]

What changed? Why was the change needed?

• Test Changes:
  • all notifications related.
  • all subscriber related.
• removed message entity from api layer.
• fixed multiple decorations regarding openApi
  -removed trigger reference inside the session object, direct usage from sdk now

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Special notes for your reviewer

[linear]

NV-4965 E2E Testing - Happy Path - Notifications

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commit: 3879bcd