Description

Get the istio proxy image reference from values file instead using hard coded reference.

How Has This Been Tested?

[ ] The title of the PR states what changed and the related issues number (used for the release note).
[ ] Does this PR requires documentation updates?
[ ] I've updated documentation as required by this PR.
[x] I have ran go fmt
[ ] I have updated the helm chart as required by this PR.
[ ] I have performed a self-review of my own code.
[x] I have commented my code, particularly in hard-to-understand areas.
[x] I have tested it for all user roles.
[ ] I have added all the required unit test cases.
[x] I have verified the E2E test cases with new code changes.
[ ] I have added all the required E2E test cases.