"No space left on device" on Windows portability tests #28025
Description
From the logs:
t:\src\github\grpc\workspace_c++_windows_dbg_native_x64_cmake_vs2017_buildonly\cmake\build\gens\src\proto\grpc\testing\xds\v3\config_dump.grpc.pb.cc(30): fatal error C1088: Cannot flush compiler intermediate file: 'T:\tmp\_CL_875d5946gl': No space left on device [T:\src\github\grpc\workspace_c++_windows_dbg_native_x64_cmake_vs2017_buildonly\cmake\build\xds_interop_server.vcxproj]
csds.pb.cc
t:\src\github\grpc\workspace_c++_windows_dbg_native_x64_cmake_vs2017_buildonly\cmake\build\gens\src\proto\grpc\testing\xds\v3\csds.pb.cc(1930): fatal error C1088: Cannot flush compiler intermediate file: 'T:\tmp\_CL_0cb8e1abgl': No space left on device [T:\src\github\grpc\workspace_c++_windows_dbg_native_x64_cmake_vs2017_buildonly\cmake\build\xds_interop_server.vcxproj]
csds.grpc.pb.cc
t:\src\github\grpc\workspace_c++_windows_dbg_native_x64_cmake_vs2017_buildonly\include\grpcpp\impl\codegen\interceptor_common.h(362): fatal error C1088: Cannot flush compiler intermediate file: 'T:\tmp\_CL_bffb840fex': No space left on device [T:\src\github\grpc\workspace_c++_windows_dbg_native_x64_cmake_vs2017_buildonly\cmake\build\xds_interop_server.vcxproj]
Full log https://source.cloud.google.com/results/invocations/433c5f6c-8571-4616-9207-b7cc67a51bb6/log
Seen in #28016