fallback check bug for scaleobject

[ctccxxd]

Report

when user config a fallback part in a scaleobject, the related webhook module check take no effect. The code has been in the project main branch, but take no effect yet.

Expected Behavior

When user have misconfiguration, such as invalid failureThreshold or replicas value. The webhook should not validate it.

Actual Behavior

Validate it even for invalid failureThreshold, replicas value, or invalid metric type.

Steps to Reproduce the Problem

I have contribute my code, welcome to review #6346.

Logs from KEDA operator

No

KEDA Version

main branch

Kubernetes Version

None

Platform

None

Scaler Details

No response

Anything else?

No response