No branch coverage

I'm unable to see any branch coverage in the "test coverage" pane. I only see statement and function coverage.

I've created a minimal example to reproduce this.

```js
// main.mjs
export function foo(arg) {
return arg ? 1 : 2; // Two branches
}
```

```js
// main.test.mjs
import { test } from 'node:test';
import { strict as assert } from 'node:assert';
import { foo } from './main.mjs';

test('test', () => {
assert.equal(foo(true), 1); // Only one branch tested
});
```

I click "run tests with coverage" in the testing panel.

The coverage breakdown doesn't show branches:


If I hover over it, it says "0/0" branches covered:


Reproduce the report with main.mjs and main.test.mjs, then run the tests with coverage from the VS Code testing panel. Inspect how the coverage breakdown represents the two branches in foo; done means the pane reports branch coverage rather than 0/0 while preserving statement and function coverage.

Written by the indexing model from the issue text.