[Bug] Incorrectly specifying a region causes "Request unauthorized" error

[atsui-bay1]

What are you really trying to do?

Create a namespace

Describe the bug

If the region is specified slightly incorrectly (i.e. aws-us-east1 instead of aws-us-east-1), the error below is shown:

│ Error: Failed to create namespace
│ 
│   on temporal.tf line 47, in resource "temporalcloud_namespace" "namespace":
│   47: resource "temporalcloud_namespace" "namespace" {
│ 
│ rpc error: code = PermissionDenied desc = Request unauthorized

This is very confusing as it has nothing to do with authentication. Note that some other misspellings produce a useful error message, such as us-west-2 (without the aws-)

│ Error: Failed to create namespace
│ 
│   on temporal.tf line 47, in resource "temporalcloud_namespace" "namespace":
│   47: resource "temporalcloud_namespace" "namespace" {
│ 
│ rpc error: code = InvalidArgument desc = invalid region: us-west-2

Minimal Reproduction

resource "temporalcloud_namespace" "namespace" {
  name     = "my-namespace"
  regions  = ["aws-us-east1"]
  accepted_client_ca =base64encode("<my_cert.pem>")
  retention_days     = 90
}

Environment/Versions

• OS and processor: [e.g. M1 Mac, x86 Windows, Linux] Linux and Mac
• Temporal Version: [e.g. 1.14.0?] Terraform Provider 0.0.9
• Are you using Docker or Kubernetes or building Temporal from source?

Additional context