Improve message returned from Anaplan Connect when user has no access to model

Description of the enhancement:

Improve the wording of messages from Anaplan Connect when a user doesn't have access to the model. 

Anaplan Connect will return the following message when you do not have access to a model in a workspace:

Model "123xyz not found in workspace "abc123"

Example of enhancement:

It could be reworded to say:
"Model "123xyz" not found in workspace "abc123", check it exists and ensure you have the correct permissions to

access it."

Story for why this enhancement is being requested:

This causes confusion to users, especially if they are using another account to run their integration. They can access the model with their personal account, but when they use the integration account it returns the above.