[Log Explorer] Add dataset deletion changelog

[Sahidya]

Summary

• announce Log Explorer dataset deletion in the Cloudflare dashboard and API
• explain deletion protection and confirmation requirements
• clarify that deletion is irreversible and asynchronous

Tests

• pnpm exec prettier --check src/content/changelog/log-explorer/2026-08-26-dataset-deletion.mdx
• pnpm exec astro check --minimumFailingSeverity=error

[cloudflare-docs-bot]

Review

✅ No issues found in commit 69f2eff.

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