Reports/Budget cost unit needs document and support currencies other than USD

[n3mawashi]

Describe the bug
When changing USD to AUD for the budget unit LZA pipeline fails
To Reproduce
Steps to reproduce the behavior.

Expected behaviour
AUD would be accepted and the pipeline would configure as expected. Otherwise, list it in the documentation, be it at the API, CFN or LZA level.

• [ * ] Version: v1.10.1.

• [ * ] Region: ap-southeast-2

• [ * ] Was the solution modified from the version published on this repository? No.

• If the answer to the previous question was yes, are the changes available on GitHub?

• [ * ] Have you checked your service quotas for the services this solution uses? Yes, no problems there.

• [ * ] Were there any errors in the CloudWatch Logs?
  Not that I could see, however codebuild log posted below.

Screenshots

AWSA-OperationsStack-*********-ap-southeast-2 | 0/29 | 1:39:05 AM | CREATE_FAILED | AWS::Budgets::Budget | accel-budgetBudgetDefinition/accel-budget (accelbudgetBudgetDefinitionaccelbudget73707CCE) Unable to create/update budget - AUD is not in the supported unit set: [USD] (Service: AWSBudgets; Status Code: 400; Error Code: InvalidParameterException; Request ID: 5ca53427-a758-4dc1-ab3e-2bbba66e6311; Proxy: null)

200 | new BudgetDefinition (/codebuild/output/src2978/src/s3/00/source/packages/@aws-accelerator/constructs/lib/aws-budgets/budget-definition.ts:175:7)
201 | _ OperationsStack.enableBudgetReports (/codebuild/output/src2978/src/s3/00/source/packages/@aws-accelerator/accelerator/lib/stacks/operations-stack.ts:740:11)
202 | _ new OperationsStack (/codebuild/output/src2978/src/s3/00/source/packages/@aws-accelerator/accelerator/lib/stacks/operations-stack.ts:122:12)
203 | _ createOperationsStack (/codebuild/output/src2978/src/s3/00/source/packages/@aws-accelerator/accelerator/utils/stack-utils.ts:830:29)
204 | _ createMultiAccountMultiRegionStacks (/codebuild/output/src2978/src/s3/00/source/packages/@aws-accelerator/accelerator/bin/app.ts:182:28)
205 | _ processTicksAndRejections (node:internal/process/task_queues:95:5)

Additional context

Additionally, there's no documentation on the cost and usage reporting. It returns a 404.
https://awslabs.github.io/landing-zone-accelerator-on-aws/classes/_aws_accelerator_config.CostAndUsageReportConfig.html