Introduce demo cleanup action

[camertron]

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What are you trying to accomplish?

This PR introduces an Actions workflow that cleans up old preview environments. We delete preview envs automatically when PRs are closed or merged, but we still had a number of old ones hanging around, ostensibly from before we implemented the auto-delete Action. These old preview envs were getting flagged by our automated security tooling. I tried to delete them manually via the Azure console but didn't have permission (what a surprise), so I decided to put in the effort to create this cleanup Action. It runs at 12 noon every day (5am PT).

Integration

No changes necessary in production.

Risk Assessment

• Low risk the change is small, highly observable, and easily rolled back.
• Medium risk changes that are isolated, reduced in scope or could impact few users. The change will not impact library availability.
• High risk changes are those that could impact customers and SLOs, low or no test coverage, low observability, or slow to rollback.

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• No new axe scan violation - This change does not introduce any new axe scan violations.

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[francinelucca]

LGTM! deferring final approval to @jonrohan

[jonrohan]

There's another workflow that's trying failing at doing this, can you delete that one also https://github.com/primer/view_components/blob/8a16336d254321f43969c9ed5b72861dc4c53c2e/.github/workflows/demo-preview-destroy.yml

[camertron]

@jonrohan I think it makes sense to keep both workflows. From what I've been able to tell, the demo-preview-destroy workflow is working as expected - we would have had a lot more old preview environments lying around if it had been failing. Almost all the ones I saw in the Azure console were quite old, probably created before we wrote that destroy Action.

This cleanup Action is really just a safeguard in case the destroy Action fails occasionally.