[test] Ensure environment var is correctly restored at the end
[test] Ensure environment var is correctly restored at the end

Assembly cleanup failed because the environment had the
`MSBUILDTARGETOUTPUTLOGGING` environment variable removed. This was
because NodePackets_Tests.TestTranslation always removed that instead of
restoring it to it's original value.

Microsoft/msbuild,cdmihai/msbuild,sean-gilliam/msbuild,chipitsine/msbuild,chipitsine/msbuild,mono/msbuild,Microsoft/msbuild,mono/msbuild,mono/msbuild,Microsoft/msbuild,chipitsine/msbuild,jeffkl/msbuild,cdmihai/msbuild,rainersigwald/msbuild,AndyGerlicher/msbuild,rainersigwald/msbuild,rainersigwald/msbuild,rainersigwald/msbuild,AndyGerlicher/msbuild,jeffkl/msbuild,mono/msbuild,AndyGerlicher/msbuild,AndyGerlicher/msbuild,cdmihai/msbuild,jeffkl/msbuild,sean-gilliam/msbuild,sean-gilliam/msbuild,Microsoft/msbuild,jeffkl/msbuild,cdmihai/msbuild,chipitsine/msbuild,sean-gilliam/msbuild