Create GCP Service Account for Vertex AI Key Setup

Description:
To set up a Vertex AI model, we need to create a Google Cloud Platform (GCP) service account and generate a key for authentication. This key will be used to integrate the Vertex AI model into our application.

Acceptance Criteria:
A new service account for Vertex AI is successfully created.
Necessary roles are assigned to the service account.
JSON key is generated and securely stored.
Documentation for using the key is shared with the team.

Start with the Vertex AI authentication requirements and the GCP service-account setup described in the issue. Confirm the required roles, generate the JSON key, and follow the team's secure storage process; the work is done when the account and key are usable and usage documentation has been shared.

Written by the indexing model from the issue text.