adjust run_tests scripts

src/csharp/Grpc.Core.Tests/SanityTest.cs

src/csharp/Grpc.Core/NativeDeps.Windows.csproj.include

...rfile/interoptest/grpc_interop_csharp/Dockerfile.template

...nteroptest/grpc_interop_csharpcoreclr/Dockerfile.template

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

...ols/dockerfile/test/csharp_jessie_x64/Dockerfile.template

tools/run_tests/helper_scripts/build_csharp.bat

tools/run_tests/helper_scripts/build_csharp.sh

tools/run_tests/helper_scripts/build_csharp_coreclr.sh

tools/run_tests/helper_scripts/pre_build_csharp.bat

tools/run_tests/helper_scripts/pre_build_csharp.sh

tools/run_tests/run_interop_tests.py

tools/run_tests/run_tests.py