acc: always include 'inherited' field in permissions (#3736)

## Why
This matches real backend behaviour.

## Tests
Restores acceptance/bundle/deployment/unbind/permissions which is broken
on cloud since #3730

Author: denik

acceptance/bundle/deployment/unbind/permissions/output.txt

@@ -11,6 +11,7 @@ Deployment complete!
 {
   "all_permissions": [
     {
+      "inherited": false,
       "permission_level": "CAN_MANAGE"
     }
   ],
@@ -31,6 +32,7 @@ Deployment complete!
 {
   "all_permissions": [
     {
+      "inherited": false,
       "permission_level": "CAN_MANAGE"
     }
   ],

libs/testserver/permissions.go

@@ -141,7 +141,9 @@ func (s *FakeWorkspace) SetPermissions(req Request) any {
 		// Convert PermissionLevel to Permission
 		if acl.PermissionLevel != "" {
 			response.AllPermissions = append(response.AllPermissions, iam.Permission{
+				Inherited:       false,
 				PermissionLevel: acl.PermissionLevel,
+				ForceSendFields: []string{"Inherited"},
 			})
 		}