Fix for msbuild server - InstallDotNetCore task redirects its outputs #10629
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Context
MSBuild server runs as long live process, similar to VBCSCompiler, as oppose to formal short living console application.
Custom Tasks which execute child process from might be broken, as output from child processes started from detached parent process are not redirected to parent process.
This PR addresses issue: dotnet/msbuild#7913
Unblocks
Changes made
Redirects outputs of child process running install-script.sh which makes it agnostics if run from process attached to terminal or form detached process such as msbuild server or worker node.
NOTE
This is second try as the 1st one causes failing tests in arcade-validation.
See: dotnet/arcade-validation#3323 and #10585