Default to warnings as errors #1525

Job	Run time
linux-oldLTS-github--dotnet-and-msbuild	8m 19s
linux-oldLTS-github--dotnet-and-xbuild	7m 13s
linux-newLTS-github--dotnet-and-xbuild	7m 17s
linux-oldLTS-vanilla--newmono	8m 16s
macOS--dotnet6-and-mono	9m 33s
macOS--mono	6m 40s
linux-newLTS-github--dotnet-and-msbuild	8m 12s
linux-newLTS-vanilla--stockmono	4m 52s
linux-oldLTS-vanilla--stockmono	6m 31s
linux-newLTS-vanilla--dotnet6	9m 29s
linux-newLTS-vanilla--newmono	6m 26s
windows--dotnet6	9m 56s
windows--legacyFramework	15m 3s
sanity-check	49s
publish	1m 15s
	1h 49m 51s

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