docs: add PowerShell Pages deployment cleanup example

[AlexMnrs]

Summary

• add tabs for the Pages deployment cleanup script
• keep the existing macOS/Linux shell example
• add a Windows PowerShell version that uses ConvertFrom-Json instead of jq

Closes #31753

Validation

• git diff --check

Note: I attempted pnpm exec prettier --check src/content/docs/pages/platform/known-issues.mdx, but it timed out locally after the dependency install did not complete within two minutes. I stopped the stale local processes and did not keep generated dependency files.

[cloudflare-docs-bot]

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✅ No issues found in commit 5330e05.

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[MattieTK]

I’ve reworked this a bit along with the shell script at the same time to catch the production env, throw if we don’t detect it, improve parallel deletion and use project name as an argument.

[AlexMnrs]

Thanks for tightening both examples, Mattie. The production-environment detection and clearer argument-based usage make the guide much stronger.

[github-actions]

Hey there, we've marked this pull request as stale because there's no recent activity on it. This label helps us identify PRs that might need updates (or to be closed out by our team if no longer relevant).

[MattieTK]

/rebase

[MattieTK]

Moved to #32273 — pushing to this branch requires write access to your fork, which I don't have, so I opened the continuation from a branch on the main repo instead. Closing this one.