[PL-45695] SMP Install Istio

[brian-f-harness]

Thanks for contributing to the Harness Developer Hub! Our code owners will review your submission.

Description

• Please describe your changes: SMP Install Istio
• Jira/GitHub Issue numbers (if any): PL-45695
• Preview links/images (Internal contributors only): Configure and deploy Istio

PR lifecycle

We aim to merge PRs within one week or less, but delays happen sometimes.

If your PR is open longer than two weeks without any human activity, please tag a code owner in a comment.

PRs must meet these requirements to be merged:

• [x] Successful preview build.
• [x] Code owner review.
• [x] No merge conflicts.
• [x] Release notes/new features docs: Feature/version released to at least one prod environment.