[cli] MAJOR: Connect a Git provider repository in vc link (#8290)

#8100 added a new `vc git` command, which allows users to connect a Git provider repository, enabling them to set up a full Git workflow for their Vercel projects without having to leave the CLI.

This PR takes this functionality a step further by including it as part of the `vc link` flow. This way, users can set up a Vercel project and add a Git provider repository all in one step.

This PR is blocked by a PR to `front` which adds an option to the Git Settings page for a Project to re-enable the prompt if the user opted out (in review).

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#### Tests

- [x] The code changed/added as part of this PR has been covered with tests
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packages/cli/test/unit/commands/git.test.ts

@@ -39,6 +39,11 @@ describe('git', () => {
         await expect(client.stderr).toOutput('Found project');
         client.stdin.write('y\n');
 
+        await expect(client.stderr).toOutput(
+          'Do you want to connect "origin" to your Vercel project?'
+        );
+        client.stdin.write('n\n');
+
         await expect(client.stderr).toOutput(
           `Connecting Git remote: https://github.com/user/repo.git`
         );