Backend(,Tests): stop using binary serialization for exceptions #3050

Job	Run time
macOS--mono-only	8m 19s
macOS--dotnet6-only	7m 45s
macOS--dotnet6-and-mono	12m 11s
linux-github--dotnet-and-newmono	4m 49s
linux-github--dotnet-and-mono	3m 45s
linux-vanilla--stockmono-only	3m 7s
windows--dotnet6-and-legacyFramework	3m 15s
windows--dotnet6-only	4m 9s
windows--legacyFramework-only	6m 15s
linux-vanilla--stockdotnet6-and-newmono	5m 48s
linux-vanilla--stockdotnet6-and-stockmono	6m 20s
linux-vanilla--stockdotnet6-only	4m 50s
linux-vanilla--newmono-only	4m 32s
conventions	0s
snap_pkg	0s
snap_pkg_beta	0s
	1h 15m 5s

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