Properly maintain the release operator image

[sdake]

(NOTE: This is used to report product bugs:
To report a security vulnerability, please visit https://istio.io/about/security-vulnerabilities/
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)

Bug description
There is a helm chart for generating operators. There is also a hand-built operator. Remove the hand-built version, and generate from the helm chart.

Affected product area (please put an X in all that apply)

[ ] Docs
[X] Installation
[ ] Networking
[ ] Performance and Scalability
[ ] Extensions and Telemetry
[ ] Security
[ ] Test and Release
[ ] User Experience
[X] Developer Infrastructure

Affected features (please put an X in all that apply)

[ ] Multi Cluster
[ ] Virtual Machine
[ ] Multi Control Plane

Expected behavior

Steps to reproduce the bug

Version (include the output of istioctl version --remote and kubectl version --short and helm version if you used Helm)

How was Istio installed?

Environment where bug was observed (cloud vendor, OS, etc)

Additionally, please consider attaching a cluster state archive by attaching
the dump file to this issue.

[sdake]

#27112

[sdake]

#22982

[sdake]

#27112

[howardjohn]

Fixed by #27112