Add ContractUpgraded event

[Akshola00]

Description

Emit upon exact successful upgrade.

Testing Requirements

Event assertion test.

• Crucial: Ensure all standard GitHub CI checks pass before submitting your PR!

Links

• See contributor.md for guidelines.

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This issue has been added to the Stellar Wave Program and is worth 150 Points.

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[Utilitycoder]

@Utilitycoder has applied to work on this issue as part of the Stellar Wave Program's 3rd wave.

Hi! I’d like to work on this issue if it’s still open. I’m confident I can deliver a PR within 24 hours of assignment.

Please assign it to me if that works for you. Thanks!

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Congratulations, @Utilitycoder! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on March 30, 2026.

🧑‍💻 @Utilitycoder: Please resolve the issue such that the repo's maintainers have enough time to review your contribution before the due date. You'll earn Points for completing the issue on-time, which will make you eligible for a share of the Stellar Wave Program's reward pool.

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