Removed saved_model_tags from OVC, improved help. (#18785)

* Removed saved_model_tags, improved help.

* Fixed help, removed to string conversion of params.

* Help corrections.

* Small correction.

* Corrected wrong changes.

* Corrected wrong changes.

* Fixed arguments creating in cli parser.

* Renamed extensions parameter to extension.

Author: popovaan

tests/layer_tests/mo_python_api_tests/test_mo_convert_extensions.py

@@ -102,9 +102,9 @@ def create_ref_graph2():
         return Model([sigmoid], [param], "test")
 
     test_data = [
-        {'params_test': {'extensions': create_custom_extension_leaky_relu_to_relu()},
+        {'params_test': {'extension': create_custom_extension_leaky_relu_to_relu()},
          'ref_graph': create_ref_graph1()},
-        {'params_test': {'extensions': [create_custom_extension_leaky_relu_to_relu(),
+        {'params_test': {'extension': [create_custom_extension_leaky_relu_to_relu(),
                                         create_custom_extension_elu_to_sigmoid()]},
          'ref_graph': create_ref_graph2()}
     ]

tests/layer_tests/mo_python_api_tests/test_mo_convert_tf.py

@@ -756,6 +756,7 @@ def __call__(self, input):
             arr[2] = 2
 
         # Check model inference
+        cmp_model = compile_model(ov_model)
         ov_infer2 = cmp_model(test_input)
         fw_infer2 = keras_model(test_input).numpy()
 
@@ -856,6 +857,7 @@ def test_memory_loss(self, ie_device, precision, ir_version, temp_dir):
         gc.collect()
 
         # Check model inference
+        cmp_model = compile_model(ov_model)
         ov_infer2 = cmp_model(test_input, ie_device)
 
         feed_dict = {"Input:0": test_input}