Core's Toolbar module doesn't display a "Dashboard" link after install

Problem/Motivation

When you first install the Dashboard module, the "Dashboard" link in the Core's Toolbar is not displayed. This can be confusing for people who are new to the module.

Flushing caches fixes it.

Steps to reproduce

1. Download drupal-11.1.6 and dashboard-2.0.0 - I did this by running...
   

   git clone --branch 2.x https://git.drupalcode.org/project/dashboard.git
   cd dashboard
   ddev config --project-type=drupal --docroot=web --php-version=8.3 --corepack-enable --project-name=dashboard
   ddev start
   ddev poser
   ddev symlink-project
   ddev config --update
   ddev restart
   ddev launch
   

2. Install Drupal using the Standard install profile.
3. Install dashboard from the Extend page at /admin/modules.
   • Expected behavior: A "Dashboard" link appears in the "Manage" section of the Toolbar
   • Actual behavior: The Toolbar is unchanged
4. Go to /admin/config/development/performance. Click the "Clear all caches" button
   • Note that after the cache is cleared, a "Dashboard" "Dashboard" link appears in the "Manage" section of the Toolbar

Proposed resolution

Not sure yet!

Remaining tasks

1. Write a patch
2. Review and feedback
3. RTBC and feedback
4. Commit
5. Release

User interface changes

None.

API changes

None.

Data model changes

None.