build: make torque patch more specific for native arm builds (#16992)

* build: make torque patch more specific

the v8_generator_toolchain should only be overriden if the snapshot toolchain is a native arm or arm64 toolchain

* Only test native mksnapshot on arm64

* Put environment variable in container

vsts-arm64v8.yml

@@ -2,6 +2,8 @@ resources:
   containers:
   - container: arm64v8-test-container
     image: electronbuilds/arm64v8:0.0.4
+    env:
+      RUN_NATIVE_MKSNAPSHOT: true
 
 jobs:
 - job: Test_Arm64