A non-informative error is printed when the Package Manager is opened without an internet connection present

Steps to reproduce:

1. Turn off your internet connection
2. Open any Project
3. Navigate to Window > Package Manager
4. Observe the Console

Actual results: A non-informative error is printed:

"[Package Manager Window] Error searching for packages.
getaddrinfo EAI_AGAIN api.unity.com"

Expected results: Error is informative, for example, what is printed on macOS:

"[Package Manager Window] Error searching for packages.
Unable to perform online search:"

Reproducible with versions: 2021.3.42f1, 2022.3.42f1, 6000.0.17f1

Tested on (OS): Ubuntu 24.04, macOS Sonoma