Assert StdErr is empty for E2E Test
Assert StdErr is empty for E2E Test

This is a quick fix to improve test diagnosability with the E2E Test. 

We see situations where the output executable fails and we are left without any error output. 

This addition should output any stderr output from the output executable.

cc @piotrpMSFT
johnbeisner/cli,FubarDevelopment/cli,jaredpar/cli,mlorbetske/cli,krwq/cli,MichaelSimons/cli,marono/cli,jkotas/cli,jonsequitur/cli,svick/cli,danquirk/cli,blackdwarf/cli,borgdylan/dotnet-cli,stuartleeks/dotnet-cli,anurse/Cli,krwq/cli,marono/cli,danquirk/cli,FubarDevelopment/cli,stuartleeks/dotnet-cli,weshaggard/cli,mlorbetske/cli,nguerrera/cli,livarcocc/cli-1,mlorbetske/cli,jaredpar/cli,gkhanna79/cli,stuartleeks/dotnet-cli,dasMulli/cli,livarcocc/cli-1,danquirk/cli,EdwardBlair/cli,MichaelSimons/cli,marono/cli,stuartleeks/dotnet-cli,harshjain2/cli,johnbeisner/cli,marono/cli,AbhitejJohn/cli,livarcocc/cli-1,svick/cli,nguerrera/cli,jkotas/cli,ravimeda/cli,jaredpar/cli,jkotas/cli,schellap/cli,jonsequitur/cli,gkhanna79/cli,jaredpar/cli,schellap/cli,EdwardBlair/cli,AbhitejJohn/cli,AbhitejJohn/cli,Faizan2304/cli,danquirk/cli,krwq/cli,JohnChen0/cli,krwq/cli,gkhanna79/cli,naamunds/cli,nguerrera/cli,blackdwarf/cli,jaredpar/cli,schellap/cli,schellap/cli,schellap/cli,harshjain2/cli,JohnChen0/cli,jonsequitur/cli,MichaelSimons/cli,EdwardBlair/cli,FubarDevelopment/cli,danquirk/cli,harshjain2/cli,nguerrera/cli,dasMulli/cli,weshaggard/cli,blackdwarf/cli,stuartleeks/dotnet-cli,gkhanna79/cli,JohnChen0/cli,marono/cli,mlorbetske/cli,borgdylan/dotnet-cli,mylibero/cli,JohnChen0/cli,borgdylan/dotnet-cli,johnbeisner/cli,jkotas/cli,ravimeda/cli,naamunds/cli,naamunds/cli,dasMulli/cli,jkotas/cli,ravimeda/cli,FubarDevelopment/cli,naamunds/cli,borgdylan/dotnet-cli,jonsequitur/cli,mylibero/cli,jaredpar/cli,AbhitejJohn/cli,Faizan2304/cli,Faizan2304/cli,mylibero/cli,naamunds/cli,weshaggard/cli,MichaelSimons/cli,mylibero/cli,borgdylan/dotnet-cli,weshaggard/cli,svick/cli,gkhanna79/cli,krwq/cli,blackdwarf/cli,MichaelSimons/cli,schellap/cli,mylibero/cli,weshaggard/cli