Remove old Istio tests, add new Istio suite with regression values

[npolshakova]

Description

Cleans up old Istio regression tests. Adds regression test with old helm values to new framework.

API changes

None

Code changes

• Removes old Istio regression tests from ci pipelines and code
• Removes old Istio glooctl tests
• Removes Istio installation from setup script
• Adds a new Istio helm setup to the new framework that uses the deprecated values (enableIstioSidecarOnGateway) to check for regressions
• Adds missing port routing test with edge apis.

CI changes

• Removed Istio regression tests

Docs changes

None

Context

Interesting decisions

None

Testing steps

• Validated k8s and gloo edge Istio integration tests run locally

Notes for reviewers

None

Checklist:

• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have added tests that prove my fix is effective or that my feature works

[github-actions]

Visit the preview URL for this PR (updated for commit d53df48):

https://gloo-edge--pr9636-npolshak-remove-old-n6o0mxt4.web.app

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[sam-heilbron]

looking great! Some small comments