Context
This pull request improves the audit and workflow tracking system by adding support for capturing and propagating approval metadata (approver username and approval time) throughout the Terraform deployment workflow. This enables improved auditability of who approved a deployment and when, with these details being tracked from the plan review gate through to audit logging and notifications. Unit tests have also been updated to cover the new approval fields.

Approval metadata propagation and tracking:

• Added ApprovedBy and ApprovedTime fields to job state structures (Job, JobState, AtlantisJobEvent, AuditJobRequest) and ensured these fields are set and passed through all relevant workflow components.
• Updated the plan review gate to return a new ReviewResult struct containing the approval status, approver username, and approval timestamp, and ensured these values are used in subsequent workflow steps and state updates.

Audit logging and notification improvements:

• Modified the SNS notifier and audit activity to include approver information in audit job requests and events, ensuring this metadata is logged and available for downstream consumers.)

Code cleanup:

• Removed outdated comments and improved documentation for new and updated structures and methods. [)

These changes collectively improve the audit trail and accountability for infrastructure changes by making approval information first-class data throughout the workflow.