Custom Widget: Management API value is wrong getting from APIM

## Bug description

i have created a custom widget in my project in which i did not add any code just has default code which get the user token and user id and after getting token and userid, there is a method which gets the user details by calling management API REST API call.

while running the custom widget as local, "Get User details" call URL will be like "https://apiportal-dev.avnet.com/mapi/users/1?api-version=2023-03-01-preview" and getting CORS error.


i am getting confused that why management API URL does not contain full URL likee this "[https://management.azure.com/subscriptions/{subscriptionId}/resourceGroups/{resourceGroupName}/providers/Microsoft.ApiManagement/service/{serviceName}](https://management.azure.com/subscriptions/%7BsubscriptionId%7D/resourceGroups/%7BresourceGroupName%7D/providers/Microsoft.ApiManagement/service/%7BserviceName%7D)"

but it returns the "https://apiportal-dev.avnet.com/mapi" endpoint as shown in below image.


## Expected behavior

Management API value should be full URL i.e https://management.azure.com/subscriptions/{subscriptionId}/resourceGroups/{resourceGroupName}/providers/Microsoft.ApiManagement/service/{serviceName}

but it returns "https://apiportal-dev.avnet.com/mapi" and also getting CORS error if we use this URL.

## Is self-hosted portal?
No

## Release tag or commit SHA (if using self-hosted version)

[e.g., release `2.0.0`, commit `c45da9778b70d369aba60fa2e63c191efe2b548f`]

## API Management service name

https://apiportal-dev.avnet.com

## Environment

- Operating system: [windows]
- Browser: [e.g., all browser]
- Version: latest

Start by reproducing the custom widget locally and trace the “Get User details” management API REST call that returns the /mapi endpoint. Compare that value with the expected management.azure.com resource URL and investigate the resulting CORS behavior; done means the management API value is correct and the call no longer fails because of the returned endpoint.

Written by the indexing model from the issue text.