Remove the Deno SDK target #2085

Tracks PR #2079.

Plan

Goal: Stop generating the deprecated Deno SDK. sdk-for-deno was last pushed on 2025-09-15, its README already points users to npm:node-appwrite, and it is absent from app/config/sdks.php in appwrite/appwrite and from example.php here.

What changes (#2079):

• Deletes src/SDK/Language/Deno.php and the whole templates/deno/ tree (client, services, models, enums, tests, README, workflows).
• Deletes the tests/e2e/Deno1193Test.php and tests/e2e/Deno1303Test.php e2e tests and tests/e2e/languages/deno/tests.ts (already outside the CI matrix).
• Drops the Deno rows from tests/generation/GenerationTest.php and the JS → Deno entry from AGENTS.md.
• Leaves intentional deno mentions: the Node README and TypeScript skill (using node-appwrite from Deno via npm) and the CLI's Deno function runtime and deno.json support.

Remaining steps: None. The linked PR is the full change.

Done when:

• chore: remove the Deno SDK target #2079 is merged.
• Generated web, node and react-native output is unchanged and the Generation suite passes on main.