Resolve "Empty project page does not show Repository section on navbar after creating first branch/file"

This MR aims to fix the rendering of the project's page after creating a README/LICENSE/.gitignore and creating the first branch of the project on the website. Pictures related with the problem this MR fixes linked in #20025 (closed)

• CHANGELOG entry added
• Documentation created/updated
• API support added
• Tests
  • Added for this feature/bug
  • All builds are passing
• Conform by the style guides
• Branch has no merge conflicts with master (if you do - rebase it please)
• Squashed related commits together

Closes #20025 (closed)