Client error responses of user sharing API should be returned as JSON responses

[AnuradhaSK]

Description

Some Error scenario related responses of user sharing API are not returned in JSON format.
Check all similar flows and fix them.

Steps to Reproduce

Start an IS and try the following curl without any setting up. No need to have any users or roles as mentioned here.

curl --location 'https://localhost:9443/t/carbon.super/api/server/v1/users/share' \
--header 'Authorization: Basic YWRtaW46YWRtaW4=' \
--header 'Content-Type: application/json' \
--data '{
    "userCriteria": {
        "userIds": [
            "f6990206-08c4-4629-aa6c-38d70698ef82"
        ]
    },
    "organizations": [
        {
            "orgId": "0e3a5ae7-e42a-4938-84d7-6060f4af0613",
            "policy": "SELECTED_ORG_ONLY",
            "roles": [
                {
                    "displayName": "app-role-1",
                    "audience": {
                        "display": "App1",
                        "type": "application"
                    }
                },
                {
                    "displayName": "org-role-1",
                    "audience": {
                        "display": "Super",
                        "type": "organization"
                    }
                }
            ]
        }
    ]
}'

response body has Sharing beyond immediate child organizations is not allowed.
It should be returned as a JSON response with error code, error message and error description. If trace id available that also should be there.

Version

IS-7.1.0-alpha

Environment Details (with versions)

No response

[BimsaraBodaragama]

You can track the PR here.