fix: restore IAMUsers resource type name to 'iam' (#996)

The migration to the generic Resource[C] pattern in #992 inadvertently
changed the ResourceTypeName from "iam" to "iam-user", breaking
backwards compatibility for users specifying --resource-types iam.

This restores the original resource type name.

Author: james00012

aws/resources/iam.go

@@ -45,7 +45,7 @@ type IAMUsersAPI interface {
 // NewIAMUsers creates a new IAMUsers resource using the generic resource pattern.
 func NewIAMUsers() AwsResource {
 	return NewAwsResource(&resource.Resource[IAMUsersAPI]{
-		ResourceTypeName: "iam-user",
+		ResourceTypeName: "iam",
 		BatchSize:        DefaultBatchSize,
 		IsGlobal:         true,
 		InitClient: WrapAwsInitClient(func(r *resource.Resource[IAMUsersAPI], cfg aws.Config) {