DBC22-6813: notify when planned events become active

[ray-oxd]

📝 Submitter

🔗 JIRA Ticket

• Ticket Link: https://moti-imb.atlassian.net/browse/DBC22-6813

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✅ Quality Assurance & Requirements

• Requirements Met: I have confirmed that all acceptance criteria from the JIRA ticket are fulfilled.
• Tested desktop in local or dev envs
• Tested mobile in local or dev envs
• Ran unit tests locally
• SonarCloud: I have verified that the SonarCloud analysis is clean/passing for this branch.

⚙️ Configuration & Environment

• New Env Variables: Does this PR require new environment variables? (Yes/No)

  If yes, please list them here and ensure they are added to secret manager, the .env.example. and the Vault by an STA.

🧪 How to Test (if required)

1. Create a saved route with notifications enabled for all event types.
2. Create a planned event along the route that is not yet active.
3. Wait for the event to become active (or simulate via populate task).
4. Verify the user receives a route notification email when the event activates.
5. Run python manage.py test apps.event.tests.test_event_populate.TestEventModel.test_planned_event_activation_triggers_update

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🔍 Reviewer Checklist

• Reviewed code for logic and cleanliness
• Re-tested desktop/mobile in local or dev envs
• Verified no new console warnings/errors
• Confirmed that any new env variables are understood/documented

[sonarqubecloud]

Quality Gate failed

Failed conditions
63.0% Duplication on New Code (required ≤ 3%)

See analysis details on SonarQube Cloud