chore: invoke exit code 0 after positive cleanup

[erise133]

Relates to

N/A

Risks

Low - This is a script improvement that adds proper exit code handling to prevent hanging. Impact is limited to cleanup script execution.

Background

What does this PR do?

Adds missing exit code handling to the cleanup script to prevent it from hanging indefinitely. The script now properly terminates after completion.

What kind of change is this?

Bug fixes (non-breaking change which fixes an issue)

Documentation changes needed?

My changes do not require a change to the project documentation.

Testing

Where should a reviewer start?

Review the cleanup script changes to verify proper exit code implementation.

Detailed testing steps

• Run the cleanup script
• Verify it completes and exits properly without hanging
• Check exit code is 0 on successful completion
• Optional: Test error cases to ensure non-zero exit codes are returned appropriately