Add cloudflare OAuth2 provider to migration allow-list

[Meldiron]

What does this PR do?

Adds cloudflare to the OAuth2 provider allow-list so project migrations carry over the Cloudflare Dashboard OAuth2 configuration (client ID only — secrets are never copied, same as every other provider).

Counterpart of appwrite/appwrite#13391, which introduces the Cloudflare OAuth2 provider. Mirrors the recent Resend addition in #223.

Test plan

• testFromArrayCloudflare covering key, enabled flag, settings, destination app ID, and that no secret fields are copied
• Existing testFromArrayNeverCopiesSecrets sweep now includes the new entry
• composer lint and ./vendor/bin/phpunit tests/Migration/Unit/Resources/OAuth2ProviderTest.php pass (6 tests, 167 assertions)

🤖 Generated with Claude Code

[greptile-apps]

Greptile Summary

Adds Cloudflare to the OAuth2 provider allow-list so migrations retain its non-secret configuration.

• Maps Cloudflare’s clientId to the destination application ID.
• Adds unit coverage for enabled state, settings, destination mapping, configuration detection, and secret exclusion.

Confidence Score: 5/5

The PR appears safe to merge with no actionable defects identified.

The Cloudflare entry follows the established provider mapping and the added test verifies that only the transferable client ID is retained while secret fields remain excluded.

Important Files Changed

Filename	Overview
src/Migration/Resources/Auth/OAuth2/OAuth2Provider.php	Adds Cloudflare using the existing generic client-ID mapping while preserving the secret-exclusion boundary.
tests/Migration/Unit/Resources/OAuth2ProviderTest.php	Covers Cloudflare resource construction, destination application ID mapping, configured state, and omission of client secrets.

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