[MP04] Allow to run multiple HTTP and HTTPS probes in parallel

In certain area, there is no single server that works well. It
may result in the validation result varied. Thus, allow device
manufacturers to configure these URLs to get expected network
status.

Bug: 139034276
Test: atest NetworkStackTests NetworkStackNextTests
Test: manually test with resource configuration
Change-Id: I5327db39b22bf9393e7a397e8f4de786075c841e