Unity Hub “Add from repository” window search bar is active when there are no projects available

Steps to reproduce:

1. Open Unity Hub
2. Open the "Add" dropdown and select "Add from repository"
3. Make sure there are no projects available
4. Observe the Search bar

Actual results: Search bar is enabled even if there's no projects to search through

Expected results: Search bar is disabled

Reproducible with versions: 3.15.0-beta.1

Tested on (OS): MacOS Silicon Sequoia 15.6.1

Notes:

• Project dropdown is disabled, for consistency reasons the search bar should be disabled as well