The "Training and Deploying a TensorFlow Model in Vertex AI" lab (lab_exercise_long.ipynb) requires apt and pip packages for graphiz

Kind of similar to #2429, however in this case not only the apt package but also the two pip packages are not installed.

The lab link: https://www.cloudskillsboost.google/course_sessions/2920314/labs/392211
The ipynb: https://github.com/GoogleCloudPlatform/training-data-analyst/blob/master/self-paced-labs/vertex-ai/vertex-ai-qwikstart/lab_exercise_long.ipynb

The `tf.keras.utils.plot_model(model, show_shapes=False, rankdir="LR")` step requires `graphviz` apt package and pip package and also `pydot` pip package. The pip packages can be added to the `requirements.txt` since this lab uses that to install dependencies. The apt install could be the first step of the notebook or added to the lab instructions preceding the requirements install.