Domain users unassign optimization

[arvindh123]

In Domain, users unassign endpoint, we have provision for multiple users for unassign in single request.

Request will be like

curl --location 'http://localhost/domains/<DOMAIN_ID>/users/unassign' \
--header 'Content-Type: application/json' \
--header 'Authorization: Bearer <TOKEN>' \
--data '{
    "user_ids" :`["user_id_1", "user_id_2", "user_id_3"]
}'

Lets take example user ids ["user_id_1", "user_id_2", "user_id_3"]

Domain users unassign logic have a for loop.
If it fails in second loop, then second and third user id are not removed and first user is remove.
The REST response will error, but in the response we could not say which all users are removed successfully and which all users not removed and which user got error

Related issue: https://github.com/absmach/magistrala/issues/2280

Please consider issue before your vote or new proposal https://github.com/absmach/magistrala/issues/2281