feature: require http_tokens for airflow-prod instances (NCC-MOJU147-9JU)

[tom-webber]

Pull Request Objective

This piece of work is being tracked in
this GitHub issue.

This PR sets airflow-prod EC2 instances to use Instance Metadata Service (IMDS) Version 2 rather than Version 1. This should improve the security profile of these instances.

Checklist

• I have reviewed the style guide
  and ensured that my code complies with it
• All checks have passed (or override label applied, if I've
  used the override-static-analysis label, I've explained why)
• I have self-reviewed my code
• I have reviewed the checks and can attest they're as expected

[github-actions]

Terraform Component 🧱: aws-analytical-platform-data-production-airflow

Checkov 🛂: failure

Trivy 🛂: failure

Static Analysis Override Label 🏷️: true

Pusher: @tom-webber, Action: pull_request, Working Directory: terraform/aws/analytical-platform-data-production/airflow, Workflow: Terraform, Marker: aws-analytical-platform-data-production-airflow_static_analysis

[github-actions]

Terraform Component 🧱: aws-analytical-platform-data-production-airflow

Terraform Initialization ⚙️: success

Terraform Validation 🤖: success

Terraform Plan 🛠️: success

Pusher: @tom-webber, Action: pull_request, Working Directory: terraform/aws/analytical-platform-data-production/airflow, Workflow: Terraform, Marker: aws-analytical-platform-data-production-airflow_plan