Add reentrancy guard to withdraw_event_funds

[Akshola00]

Description

Use the existing reentrancy module logic to lock the pool during transfer.

Testing Requirements

Security test to ensure lock is engaged.

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

Links

• See contributor.md for guidelines.

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[sonoflawal]

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

i would love to work on this issue

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

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