DOCS-466: Clarify AWS IAM partition and deployment support

[harrison-akeyless]

Summary

• add explicit AWS partition support coverage for aws, aws-us-gov, and aws-cn on the AWS IAM auth page
• add partition-aware --sts-url and ARN guidance in CLI auth reference for both create aws-iam and update aws-iam
• add an AWS deployment pattern support matrix covering Amazon EC2, Amazon EC2 Outposts, AWS Snow Family, Amazon EKS, Amazon ECS, and AWS Fargate
• add authoritative AWS source links for partitions, Regions, services-by-Region, and compute services, plus a CLI command to list account-enabled Regions

[coderabbitai]

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 198eae21-b550-45bb-b483-aa096b6e24ce

📥 Commits

Reviewing files that changed from the base of the PR and between 98bd81f and 261d60f.

📒 Files selected for processing (10)

• docs/Accessing Akeyless/access-and-authentication-methods/auth-with-aws.md
• docs/Advanced Functionality/aws-best-practices/_order.yaml
• docs/Advanced Functionality/aws-best-practices/aws-partition-and-deployment-support.md
• docs/Advanced Functionality/aws-best-practices/deploy-a-gateway-using-cloudformation.md
• docs/Advanced Functionality/aws-best-practices/index.md
• docs/Advanced Functionality/aws-best-practices/terraform-centralized-deployment.md
• docs/Advanced Functionality/aws-best-practices/terraform-distributed-deployment.md
• docs/Akeyless Gateway/deploy-gateway/gateway-cloud-platform-deployments/gateway-deploy-amazon-eks.md
• docs/Akeyless Gateway/deploy-gateway/gateway-cloud-serverless-deployments/gateway-deploy-serverless-aws.md
• docs/Integrations & Plugins/cli-reference/cli-ref-auth/index.md

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch v1.0_docs-466-aws-partition-guidance

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