Add runnable support for Deno.test (#34593)

example of detected code:
```ts
Deno.test("t", () => {
  console.log("Hello, World!");
});

Deno.test(function azaz() {
  console.log("Hello, World!");
});
```

I can't build zed locally so I didn't test this, but I think the code is
straightforward enough, hopefully someone else can verify it

Closes #ISSUE

Release Notes:

- N/A

docs/src/languages/deno.md

@@ -57,6 +57,40 @@ See [Configuring supported languages](../configuring-languages.md) in the Zed do
 TBD: Deno Typescript REPL instructions [docs/repl#typescript-deno](../repl.md#typescript-deno)
 -->
 
+## DAP support
+
+To debug deno programs, add this to `.zed/debug.json`
+
+```json
+[
+  {
+    "adapter": "JavaScript",
+    "label": "Deno",
+    "request": "launch",
+    "type": "pwa-node",
+    "cwd": "$ZED_WORKTREE_ROOT",
+    "program": "$ZED_FILE",
+    "runtimeExecutable": "deno",
+    "runtimeArgs": ["run", "--allow-all", "--inspect-wait"],
+    "attachSimplePort": 9229
+  }
+]
+```
+
+## Runnable support
+
+To run deno tasks like tests from the ui, add this to `.zed/tasks.json`
+
+```json
+[
+  {
+    "label": "deno test",
+    "command": "deno test -A --filter '/^$ZED_CUSTOM_DENO_TEST_NAME$/' $ZED_FILE",
+    "tags": ["js-test"]
+  }
+]
+```
+
 ## See also:
 
 - [TypeScript](./typescript.md)