CCM-10927 Fix stage name

Author: aidenvaines-cgi

infrastructure/terraform/components/api/api_gateway_stage_main.tf

@@ -1,5 +1,5 @@
 resource "aws_api_gateway_stage" "main" {
-  stage_name    = var.environment
+  stage_name    = "main"
   description   = "Templates API stage ${var.environment}"
   rest_api_id   = aws_api_gateway_rest_api.main.id
   deployment_id = aws_api_gateway_deployment.main.id