Remove double validation for mgmt api v4alpha

# Feature Request

Currently we are in the process of introducing a JSON-schema validation for MGMT api v4. This will be done in an interceptor and the current validation mechanism on expanded `JsonObject` should be disabled for `v4` controllers

## Which Areas Would Be Affected?

_e.g., DPF, CI, build, transfer, etc._

## Why Is the Feature Desired?

_Are there any requirements?_

## Who will sponsor this feature?

_Please @-mention the committer that will sponsor your feature_.

## Solution Proposal

_If possible, provide a (brief!) solution proposal._