feat: Upgrade page instead of banner (#11202)

# Pull Request Template

## Description

This PR will replace the upgrade banner with an upgrade page view.

## Type of change

- [x] Bug fix (non-breaking change which fixes an issue)

## How Has This Been Tested?

### Loom video

https://www.loom.com/share/0f2b4b09acdd4404bf3211184a470227?sid=7ed60a99-0299-4642-b907-2af8c4dcc643


## Checklist:

- [x] My code follows the style guidelines of this project
- [x] I have performed a self-review of my code
- [x] I have commented on my code, particularly in hard-to-understand
areas
- [ ] I have made corresponding changes to the documentation
- [x] My changes generate no new warnings
- [ ] I have added tests that prove my fix is effective or that my
feature works
- [x] New and existing unit tests pass locally with my changes
- [ ] Any dependent changes have been merged and published in downstream
modules

---------

Co-authored-by: Pranav <pranavrajs@gmail.com>

app/policies/account_policy.rb

@@ -8,7 +8,7 @@ class AccountPolicy < ApplicationPolicy
   end
 
   def limits?
-    @account_user.administrator?
+    @account_user.administrator? || @account_user.agent?
   end
 
   def update?