Cherry-pick: chore: Remove pull_request trigger for closed events in release pipeline

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Cherry-pick to main

This PR cherry-picks the changes from #212 which was merged to release/0.8.x.

Original PR

• PR: chore: Remove pull_request trigger for closed events in release pipeline #212
• Title: chore: Remove pull_request trigger for closed events in release pipeline
• Author: @frontegg-david
• Merged to: release/0.8.x

Action Required

Please review this cherry-pick to ensure it applies correctly to main.

If the changes are NOT needed in main, close this PR.

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