[clean] only install istiod when kmesh run e2e test

[LiZhenCheng9527]

What type of PR is this? /kind cleanup

What this PR does / why we need it:

Which issue(s) this PR fixes: Fixes #

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

[gemini-code-assist[bot]]

Summary of Changes

Hello @LiZhenCheng9527, I'm Gemini Code Assist[^1]! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request refactors the Istio installation process within the Kmesh end-to-end test suite. The primary goal is to streamline the test environment setup by transitioning from istioctl to helm for deploying Istio components, ensuring that only necessary parts like istiod are installed and properly initialized. This change aims to make the e2e tests more efficient and reliable by providing a more controlled and explicit Istio deployment.

Highlights

• Istio Installation Method Change: The method for installing Istio components in the e2e test environment has been updated, transitioning from using istioctl to helm for deployment.
• Explicit Istiod Readiness Check: A new mechanism has been introduced to explicitly wait for the istiod pod to reach a 'Running' state before proceeding with further test setup, enhancing test reliability.
• Streamlined Istio Setup: The setup_istio function now focuses specifically on installing istiod with ambient mode enabled, removing previous configurations for gateway-api CRDs and ingress gateways, aligning with a more targeted test environment.

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Helm charts now deploy, Istiod waits, running free, Tests run smooth and fast.

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[codecov[bot]]

Codecov Report

:white_check_mark: All modified and coverable lines are covered by tests. :white_check_mark: Project coverage is 37.84%. Comparing base (3af835f) to head (fe941b3). :warning: Report is 6 commits behind head on main. see 1 file with indirect coverage changes

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[hzxuzhonghu]

Our document should also be updated

[hzxuzhonghu]

/lgtm /approve

[kmesh-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: hzxuzhonghu

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Needs approval from an approver in each of these files:

• ~~test/OWNERS~~ [hzxuzhonghu]

Approvers can indicate their approval by writing /approve in a comment Approvers can cancel approval by writing /approve cancel in a comment