Removing iam_roles from multiple modules

This commits removes the iam_roles variables from the modules:
 - artifact-registry
 - bigtable-instance
 - cloud-function
 - container-registry
 - endopoints
 - pubsub
 - source-repository

modules/endpoints/variables.tf

@@ -16,27 +16,22 @@
 
 variable "grpc_config" {
   description = "The configuration for a gRPC enpoint. Either this or openapi_config must be specified."
-  type        = object({
+  type = object({
     yaml_path          = string
     protoc_output_path = string
   })
 }
 
-variable "iam_roles" {
-  description = "Authoritative for a given role. Updates the IAM policy to grant a role to a list of members."
-  type        = list(string)
-  default     = []
-}
 
 variable "iam_members" {
   description = "Authoritative for a given role. Updates the IAM policy to grant a role to a list of members. Other roles within the IAM policy for the instance are preserved."
-  type        = map(list(string))
+  type        = map(set(string))
   default     = {}
 }
 
 variable "openapi_config" {
   description = "The configuration for an OpenAPI endopoint. Either this or grpc_config must be specified."
-  type        = object({
+  type = object({
     yaml_path = string
   })
 }