refactor, chore, fix(egen): Pipeline documentation link update, removes GPU from machineSpec in the pipeline, package version updates, fixes import errors

[SumanthKasula99]

This PR consists of the following updates:

1. Updates Google Cloud pipeline components documentation link.
2. Refactors the notebook according to the notebook template (removes boilerplate elements, renames REGION with LOCATION and re-structures the sections).
3. Adds link for Colab enterprise.
4. Removes the usage of future tense(will) according to the guidelines.
5. Removes GPU from the machineSpec in CustomTrainingJobOp as the job ran fine using CPU and the machine type is updated to "n1-standard-4"
6. "dedicated_resources_machine_type" is updated to "n1-standard-4" in ModelDeployOp.
7. Fixes import error regarding importer_node due to package version update.
8. Updates kfp to 2.7.0 and pipeline component to 2.15.0.

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• 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.

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