(CDPE-7090) Leverage for powershell jobs

I don't completely understand what's going on, but somewhere in our 3-deep  powershell script execution, the exit code of the CD4PE job is getting swallowed and turned into 0 every time. This results in a lot of false positives for users running jobs on windows agents. By adding this exit statement, pdk test unit, for example, will exit 1 when tests fail now. Rejoice.

Author: eputnam

tasks/run_cd4pe_job.rb

@@ -409,7 +409,7 @@ def run_with_system(manifest_type)
 
     cmd_to_execute = local_job_script
     if (@windows_job)
-      cmd_to_execute = "powershell \"& {&'#{local_job_script}'}\""
+      cmd_to_execute = "powershell \"& {&'#{local_job_script}';exit $LASTEXITCODE}\""
     end
 
     run_system_cmd(cmd_to_execute)