Feature: courses use the split lesson/project counts

[BodiAli]

Because

The purpose of this PR is it reduces confusion on how much lessons each course have in the dashboard interface by displaying the number of lessons independently from number of projects, as I already clarified in this issue I opened: https://github.com/TheOdinProject/theodinproject/issues/4542

This PR

• courses viewed in the dashboard now follows the syntax of "(Number of lessons) Lesson(s) / (Number of projects) Project(s)"

Issue

Closes #4542

Additional Information

Pull Request Requirements

• [x] I have thoroughly read and understand The Odin Project Contributing Guide
• [x] The title of this PR follows the keyword: brief description of change format, using one of the following keywords:
  • Feature - adds new or amends existing user-facing behavior
  • Chore - changes that have no user-facing value, refactors, dependency bumps, etc
  • Fix - bug fixes
• [x] The Because section summarizes the reason for this PR
• [x] The This PR section has a bullet point list describing the changes in this PR
• [x] I have verified all tests and linters pass after making these changes.
• [x] If this PR addresses an open issue, it is linked in the Issue section
• [ ] If applicable, this PR includes new or updated automated tests