refactor, chore(egen): Removes boilerplate, heading fixes, and other corrections from template

[nileshspringml]

REQUIRED:

• Removed boilar code
• Changed REGION variable name to LOCATION
• Hardcode tensorflow version to 2.15.1
• Removed os.getenv("IS_TESTING") while cleanup bucket
• Adapted notebook with new template

Adapted notebook with new notebook template and removed unwanted code

REQUIRED: Fill out the below checklists or remove if irrelevant

1. If you are opening a PR for Official Notebooks under the notebooks/official folder, follow this mandatory checklist:

• Use the notebook template as a starting point.
• Follow the style and grammar rules outlined in the above notebook template.
• Verify the notebook runs successfully in Colab since the automated tests cannot guarantee this even when it passes.
• Passes all the required automated checks. You can locally test for formatting and linting with these instructions.
• You have consulted with a tech writer to see if tech writer review is necessary. If so, the notebook has been reviewed by a tech writer, and they have approved it.
• This notebook has been added to the CODEOWNERS file under the Official Notebooks section, pointing to the author or the author's team.
• The Jupyter notebook cleans up any artifacts it has created (datasets, ML models, endpoints, etc) so as not to eat up unnecessary resources.

2. If you are opening a PR for Community Notebooks under the notebooks/community folder:

• This notebook has been added to the CODEOWNERS file under the Community Notebooks section, pointing to the author or the author's team.
• Passes all the required formatting and linting checks. You can locally test with these instructions.

3. If you are opening a PR for Community Content under the community-content folder:

• Make sure your main Content Directory Name is descriptive, informative, and includes some of the key products and attributes of your content, so that it is differentiable from other content
• The main content directory has been added to the CODEOWNERS file under the Community Content section, pointing to the author or the author's team.
• Passes all the required formatting and linting checks. You can locally test with these instructions.

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[gericdong]

/gcbrun

[kittyabs]

no edits required

[katiemn]

/gcbrun