build: fix gyp configs in debug

[legendecas]

Gyp generated build files should be able to be built in either Release/Debug mode.

• make: single entry build file, two configurations by cli: make -C out BUILDTYPE=Release and make -C out BUILDTYPE=Debug.
• msbuild: single entry build file, two configurations by cli: msbuild node.sln /p:Configuration=Release and msbuild node.sln /p:Configuration=Debug.
• ninja: two directories in out/, build with ninja -C out/Release or ninja -C out/Debug.

Variables that changes with either Release or Debug configuration should be defined in a configuration level, instead of the root level. Example: https://github.com/nodejs/node/blob/8e5d88b6413558b6b4bc127f87fc8122311639ae/common.gypi#L132-L133

This fixes generating invalid build files.

Additionally, v8_gypfiles/toolchain.gypi duplicates defines in v8_gypfiles/features.gypi. Remove the duplications in toolchains.gypi

Fixes: https://github.com/nodejs/node/issues/53446