.exe file for OutputType=Exe should not be flow with ProjectReference

[yyjdelete]

Issue Title

.exe file for project with OutputType=Exe should not be flow with ProjectReference

Reproduce Step

netcoreapp3.1 or 5.0preview is needed

1. dotnet new console -n c1
2. dotnet new console -n c2
3. dotnet add c1 reference c2
4. dotnet build c1

Expected

c2.exe should not be included in the output of c1, only c2.dll is needed.
Or c2.deps.json(and maybe also c2.runtimeconfig.json) should be included to make c2.exe really executable.

Actual

c2.exe is included. But it can not be executed without an c2.deps.json and is useless(assembly reference only need the dll files, I didn't see any usage for the .exe file)

[dsplaisted]

See also #1675