Don't install DevHomeGitHubExtension on first run #4072

Job	Run time
build-and-test (Release, x64, windows-latest, 8.0.x)	3m 18s
build-and-test (Release, x64, windows-latest, 8.0.x)	4m 24s
build-and-test (Release, x64, windows-latest, 8.0.x)	4m 27s
build-and-test (Release, x64, windows-latest, 8.0.x)	3m 54s
build-and-test (Release, x64, windows-latest, 8.0.x)	4m 14s
build-and-test (Release, x64, windows-latest, 8.0.x)	3m 44s
build-and-test (Release, x64, windows-latest, 8.0.x)	9m 18s
build-and-test (Release, x64, windows-latest, 8.0.x)	13m 30s
build-and-test (Release, arm64, windows-latest, 8.0.x)	3m 25s
build-and-test (Release, arm64, windows-latest, 8.0.x)	4m 20s
build-and-test (Release, arm64, windows-latest, 8.0.x)	4m 29s
build-and-test (Release, arm64, windows-latest, 8.0.x)	3m 53s
build-and-test (Release, arm64, windows-latest, 8.0.x)	4m 18s
build-and-test (Release, arm64, windows-latest, 8.0.x)	3m 40s
build-and-test (Release, arm64, windows-latest, 8.0.x)	9m 28s
build-and-test (Release, arm64, windows-latest, 8.0.x)	14m 22s
build-and-test (Debug, x86, windows-latest, 8.0.x)	3m 21s
build-and-test (Debug, x86, windows-latest, 8.0.x)	4m 24s
build-and-test (Debug, x86, windows-latest, 8.0.x)	4m 27s
build-and-test (Debug, x86, windows-latest, 8.0.x)	3m 54s
build-and-test (Debug, x86, windows-latest, 8.0.x)	4m 19s
build-and-test (Debug, x86, windows-latest, 8.0.x)	3m 45s
build-and-test (Debug, x86, windows-latest, 8.0.x)	9m 23s
build-and-test (Debug, x86, windows-latest, 8.0.x)	8m 41s
	2h 16m 58s

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