chore, fix, refactor(egen): minor updates to custom model training and batch prediction notebook

[krishr2d2]

This PR consists of the following updates to the `custom_model_training_and_batch_prediction.ipynb` notebook:

• Changed REGION variable name to LOCATION.
• Replaced aip with aiplatform.
• Replaced K80 GPU with T4 GPU (as K80 is deprecated).
• Replaced version 2-5 with version 2-13 in both training and deployment images and and also changed the path of images.
• Replaced base_image tensorflow latest version with tensorflow 2.13.0 version in the component
• Added .keras extension when saving and uploading the model.
• Replaced imageuri 2-3 version with 2-13 version in import model step in pipeline and also changed the path of imageuri.
• Removed IS_TESTING from the cleaning up section.
• Removed import statement of os module.
• Added colab enterprise logo with link
• Heading changes according to template guidelines
• Added comments for cells needed.
  
  
  
  

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