Backend/Networking: retry/catch SocketError=99 #2785

Job	Run time
macOS--mono-only	52s
macOS--dotnet6-and-mono	53s
windows--dotnet6-and-legacyFramework	2m 55s
linux22-github--dotnet-and-mono	47s
windows--dotnet6-only	4m 16s
macOS--dotnet6-only	1m 15s
windows--legacyFramework-only	7m 5s
linux22-github--dotnet-and-newmono	1m 10s
linux22-vanilla--newmono-only	2m 33s
linux22-vanilla--stockdotnet6-and-newmono	2m 22s
linux22-vanilla--stockdotnet6-and-stockmono	1m 20s
linux22-vanilla--stockdotnet6-only	51s
linux22-vanilla--stockmono-only	1m 29s
linux20-github--dotnet-and-mono	49s
linux20-github--dotnet-and-newmono	1m 10s
linux20-vanilla--stockmono-only	1m 52s
linux20-vanilla--newmono-only	2m 31s
conventions	0s
snap_pkg	0s
	34m 10s

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