Colab standardize restarts

[zeroasterisk]

copy/paste 3 json blocks into colabs for "search" and "gemini" for runtime restart standardization.

I spot-checked 2 of the colabs and they are working correctly.

Want to land this PR before editing more of the colabs.

Related to issue #280

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[lavinigam-gcp]

Thank you, Alan, for raising the PR. I have marked respective owners of the notebook as the reviewer.

[holtskinner]

The lint error is a false alarm. I'm adding a commit for a .gitleaksignore to handle this.