Feat: transit processor portal link for admin dashboard

[lalver1]

Closes #2268

This PR adds a button that links to the TransitProcessor's portal so that a user can open the portal in a new tab.

To test

• Apply the migration introduced by this PR: python manage.py migrate
• Reset your database to local_fixtures.json if needed
• Using the admin panel
  • In Groups add a CST group
  • In Transit Agencys add CST to the Staff group and Customer service group fields
  • In Transit processors add https://control.littlepay.com to the Portal url field
  • In Users add CST to your Chosen groups and remove the Superuser status property from your user
• Log in using the sample agency user and verify that the home dashboard has the button to the portal
• Set the Portal url field to blank and verify that the Transit Processor section does not appear in the home dashboard

[github-actions]

Coverage report

Click to see where and how coverage changed

File	Statements	Missing	Coverage	Coverage (new stmts)	Lines missing
benefits
admin.py
benefits/core
models.py
Project Total

This report was generated by python-coverage-comment-action

[thekaveman]

Would it be possible to bake some of these setup steps into the fixtures file?

E.g. creating a transit agency user and group, linking everything together, adding a sample portal link...

[lalver1]

Ah good idea, cd854a6 should simplify the setup

[thekaveman]

Ah good idea, cd854a6 should simplify the setup

This is great! But I'd still like to shortcut the user setup. I created a local user account and exported the JSON, can you please add this to the fixture here?

{
  "model": "auth.user",
  "pk": 3,
  "fields": {
    "password": "pbkdf2_sha256$870000$5pS1ll33O6bi2rCCELW8kZ$OvFJJIERCEE0H2RhI8WzKTi+tFhbrfo/sxFdwAUzESI=",
    "last_login": null,
    "is_superuser": false,
    "username": "cst-user",
    "first_name": "CST",
    "last_name": "User",
    "email": "[email protected]",
    "is_staff": true,
    "is_active": true,
    "date_joined": "2024-09-17T18:54:46Z",
    "groups": [2],
    "user_permissions": []
  }
}

The account details are stored in a shared LastPass item: Benefits Admin sample agency user.

I also think it would be most helpful if our default value (in .env.sample) for SSO_SHOW_FORM_ON_ADMIN_PAGE=True to make logging in with sample users locally much easier.

[lalver1]

I was wondering how to streamline it further and this is great, thanks! The changes are in eba2877

[thekaveman]

Fantastic, thank you for addressing my feedback!