Bug 1773223 - Remove now irrelevant gn processor tests. a=RyanVM

...end/data/gn-processor/gn-configs/x64_False_x64_linux.json

...ckend/data/gn-processor/gn-configs/x64_False_x64_mac.json

...kend/data/gn-processor/gn-configs/x64_True_x64_linux.json

.../test/backend/data/gn-processor/ipc/chromium/src/header.h

...mozbuild/test/backend/data/gn-processor/ipc/glue/header.h

...ozbuild/mozbuild/test/backend/data/gn-processor/moz.build

.../backend/data/gn-processor/tools/profiler/public/header.h

...d/mozbuild/test/backend/data/gn-processor/trunk/moz.build

.../backend/data/gn-processor/trunk/webrtc/build/function.cc

...nd/data/gn-processor/trunk/webrtc/build/no_op_function.cc

...d/data/gn-processor/trunk/webrtc/modules/include/header.h

python/mozbuild/mozbuild/test/backend/test_gn_processor.py

python/mozbuild/mozbuild/test/python.ini