Template Sync: align importStrategy in typescript to python

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### 🔄 Template Sync Required

Changes from the upstream [vscode-python-tools-extension-template](https://github.com/microsoft/vscode-python-tools-extension-template) have not yet been incorporated into this repository.

#### Source PR
- microsoft/vscode-python-tools-extension-template#158 — align importStrategy in typescript to python

#### Summary
The template updated the default value of `importStrategy` in `getGlobalSettings()` from `'fromEnvironment'` to `'useBundled'` in `src/common/settings.ts`, to align with the `useBundled` default used in `getWorkspaceSettings()` and in `package.json`. In this repository, `getWorkspaceSettings()` already uses `'useBundled'` as the default (already synced), but `getGlobalSettings()` still falls back to `'fromEnvironment'`.

#### Files with missing changes

- **`src/common/settings.ts`**: In `getGlobalSettings()`, line 153, the `importStrategy` fallback default is still `'fromEnvironment'` instead of `'useBundled'`:
```ts
importStrategy: getGlobalValue(string)(config, 'importStrategy', 'fromEnvironment'),
```
This is inconsistent with the workspace settings default (`'useBundled'`) and with the `package.json` schema default (`"useBundled"`).

#### Suggested fix

````diff
--- a/src/common/settings.ts
+++ b/src/common/settings.ts
@@ -150,7 +150,7 @@ export async function getGlobalSettings(namespace: string, includeInterpreter?:
interpreter: interpreter ?? [],
- importStrategy: getGlobalValue(string)(config, 'importStrategy', 'fromEnvironment'),
+ importStrategy: getGlobalValue(string)(config, 'importStrategy', 'useBundled'),
showNotifications: getGlobalValue(string)(config, 'showNotifications', 'off'),
};
````

#### Files skipped

- `package.json`: The `flake8.importStrategy` default is already `"useBundled"` in this repository — no change needed.

---
🤖 This issue was auto-generated by the [`extension-template-sync`](.github/workflows/extension-template-sync.yml) workflow.

> Generated by [Extension Template Sync](https://github.com/microsoft/vscode-flake8/actions/runs/23098830838) · [◷](https://github.com/search?q=repo%3Amicrosoft%2Fvscode-flake8+is%3Aissue+%22gh-aw-workflow-call-id%3A+microsoft%2Fvscode-flake8%2FExtension+Template+Sync%22&type=issues)

Open src/common/settings.ts and inspect getGlobalSettings(), comparing its importStrategy fallback with getWorkspaceSettings() and the package.json schema default. The issue is complete when the global fallback consistently uses useBundled and the repository’s relevant checks pass.

Written by the indexing model from the issue text.