PR-cleanup should remove github environments

These should be cleaned up when a PR is closed or merged
<img width="1012" height="1236" alt="Image" src="https://github.com/user-attachments/assets/851b75bd-e63f-4e56-970b-bf6d14a9a6e9" />

-- This applies to all Steeltoe web properties that have the same PR flow, so once we have a working solution, also apply to initializr-web, initializr-service, netcoretoolservice, etc
