Describe the bug:
no_proxy also won't work in this case. This is a regression from #41689.

The full story is like:

1. We supported auto-loading env var: http_proxy in config: Set the default value of the network_http_proxy_uri setting via the http_proxy variable #41209
2. We disabled it for tests in wpt: Disable proxy for test-wpt unless users know what they are doing #41441 and Unit Tests: Disable proxy for local tests #41688
3. We started to support loading https_proxy and no_proxy in net: Support no_proxy and https_proxy #41689

To Reproduce:
Suppose you set up https_proxy. Then run
./mach test-wpt -r tests\wpt\tests\webdriver\tests\classic\perform_actions\pointer_touch.py