Create GCP Service Account for Vertex AI Key Setup

[mSaadSalman]

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.