Removed test/generate_code.{sh|bat} (#6873)

* removed test/generate_code.{sh|bat}

remove c++0x from generate_code.py

added check generate code script in python

add windows specific call

added flags to generate_code.py

Set c++-0x on BUILD_LEGACY

Skip generating monster_extra if requested

* added option to skip monster extra

* add conditional to skip 2010 check gen

.github/workflows/build.yml

@@ -136,7 +136,9 @@ jobs:
     - name: cmake
       run: CXX=${{ matrix.cxx }} cmake -G "Unix Makefiles" -DFLATBUFFERS_BUILD_TESTS=OFF -DCMAKE_BUILD_TYPE=Release . && make -j4
     - name: Generate
-      run: bash scripts/check-generate-code.sh && bash scripts/check-grpc-generated-code.sh
+      run: scripts/check_generate_code.py
+    - name: Generate gRPC
+      run: bash scripts/check-grpc-generated-code.sh
 
   build-benchmarks:
     name: Build Benchmarks (on Linux)