Merge pull request #8048 from jtattermusch/dotnetcli_interoptest

src/csharp/Grpc.IntegrationTesting.Client/project.json

src/csharp/Grpc.IntegrationTesting.QpsWorker/project.json

src/csharp/Grpc.IntegrationTesting.Server/project.json

src/csharp/Grpc.IntegrationTesting.StressClient/project.json

src/csharp/Grpc.IntegrationTesting/project.json

templates/src/csharp/build_options.include

templates/tools/dockerfile/csharp_dotnetcli_deps.include

...nteroptest/grpc_interop_csharpcoreclr/Dockerfile.template

...ls/dockerfile/test/csharp_coreclr_x64/Dockerfile.template

...kerfile/interoptest/grpc_interop_csharpcoreclr/Dockerfile

...e/interoptest/grpc_interop_csharpcoreclr/build_interop.sh

tools/dockerfile/test/csharp_coreclr_x64/Dockerfile

tools/run_tests/run_interop_tests.py