When using return_ids send back a list of strings instead of ints.

When we used ints and passed this data into a nother call like:
    - name: Create a job template with a looked up credential from a folded lookup
      tower_job_template:
        name: "{{ job_template_name }}"
        credentials: >-
            {{ lookup(
                'awx.awx.tower_api',
                'credentials',
                query_params={ 'name' : credential_name },
                return_ids=True,
                expect_one=True,
                wantlist=True
            ) }}
        project: "{{ project_name }}"
        inventory: Demo Inventory
        playbook: hello_world.yml
        job_type: run
        state: present
      register: create_jt

Ansible would raise this warning:
[WARNING]: The value 30 (type int) in a string field was converted to '30' (type string). If this does not look like what you expect, quote the entire value to ensure it does not change.

Returning a list of strings prevents that.

awx_collection/plugins/lookup/tower_api.py

@@ -52,6 +52,7 @@ options:
     description:
       - If response contains objects, promote the id key to the top-level entries in the list.
       - Allows looking up a related object and passing it as a parameter to another module.
+      - This will convert the return to a string or list of strings depending on the number of selected items.
     type: boolean
     aliases: [return_id]
     default: False
@@ -160,9 +161,9 @@ class LookupModule(LookupBase):
 
         if self.get_option('return_ids'):
             if 'results' in return_data:
-                return_data['results'] = [item['id'] for item in return_data['results']]
+                return_data['results'] = [str(item['id']) for item in return_data['results']]
             elif 'id' in return_data:
-                return_data = return_data['id']
+                return_data = str(return_data['id'])
 
         if self.get_option('return_objects') and 'results' in return_data:
             return return_data['results']