test: use net8.0 for webview2 tests #21517

Job	Run time
ubuntu-22.04 (chromium - Node.js 18)	11m 49s
ubuntu-22.04 (firefox - Node.js 18)	24m 48s
ubuntu-22.04 (webkit - Node.js 18)	17m 34s
ubuntu-22.04 (chromium - Node.js 16)	12m 7s
ubuntu-22.04 (chromium - Node.js 20)	12m 44s
ubuntu-20.04 (chromium tip-of-tree)	11m 28s
Test Runner (ubuntu-latest, 18, 1/2)	12m 4s
Test Runner (ubuntu-latest, 18, 2/2)	14m 10s
Test Runner (windows-latest, 18, 1/2)	17m 51s
VSCode Extension	7m 11s
Test Runner (windows-latest, 18, 2/2)	20m 49s
Test Runner (macos-latest, 18, 1/2)	24m 30s
Test Runner (macos-latest, 18, 2/2)	16m 33s
Web Components	1m 43s
Test Runner (ubuntu-latest, 16, 1/2)	12m 4s
Test Runner (ubuntu-latest, 16, 2/2)	14m 4s
Test Runner (ubuntu-latest, 20, 1/2)	11m 43s
Test Runner (ubuntu-latest, 20, 2/2)	14m 15s
Installation Test ubuntu-latest	11m 17s
Installation Test macos-latest	16m 31s
Installation Test windows-latest	16m 30s
	5h 1m 45s

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