Turn on IE and NG python APIs by default inside Model Optimizer (#5721)

* Turn on IE and NG python APIs by default inside Model Optimizer

* Remove fallback

* Fix mo_ut

* Remove MO wheel tests

* Add model_optimizer custom target to gather all MO deps inside single traget

* Fix PR comments

.github/workflows/mo.yml

@@ -62,42 +62,4 @@ jobs:
           mkdir ../mo-ut-logs
           python3 -m xmlrunner discover -p *_test.py --output=../mo-ut-logs
         working-directory: model-optimizer
-  
-  build_wheel:
-    name: Build Python wheel
-    runs-on: ubuntu-18.04
-    steps:
-      - uses: actions/checkout@v2
 
-      - name: Install dependencies
-        run: |
-          python3 -m pip install --upgrade pip
-          python3 -m pip install wheel setuptools
-          python3 -m pip install tensorflow==2.3.0
-      
-      - name: Build
-        run: |
-          python3 setup.py sdist bdist_wheel
-        working-directory: model-optimizer
-      
-      - name: Test package content
-        run: |
-          echo "src = open('openvino_mo.egg-info/SOURCES.txt', 'rt').read().split()" | tee -a test_wheel.py
-          echo "ref = open('automation/package_BOM.txt', 'rt').read().split()"       | tee -a test_wheel.py
-          echo "for name in ref:"                                                    | tee -a test_wheel.py
-          echo "  if name.endswith('.py'):"                                          | tee -a test_wheel.py
-          echo "    assert name in src or './' + name in src, name + ' file missed'" | tee -a test_wheel.py
-          python3 test_wheel.py
-        working-directory: model-optimizer
-
-      - name: Test conversion
-        run: |
-          wget -q http://download.tensorflow.org/models/mobilenet_v1_2018_08_02/mobilenet_v1_1.0_224.tgz
-          tar -xf mobilenet_v1_1.0_224.tgz
-          python3 -m pip install model-optimizer/dist/*.whl
-          python3 -m mo --input_model mobilenet_v1_1.0_224_frozen.pb --input_shape "[1,224,224,3]"
-
-      - uses: actions/upload-artifact@v2
-        with:
-          name: mo_wheel
-          path: "model-optimizer/dist/*.whl"