Adding unit/functional tests, fixing tests

Making common class for LabelList

Fixing related field name

Fixing get_effective_slice_ct to look for corerct field and also override _eager_field

awx_collection/plugins/modules/schedule.py

@@ -73,6 +73,8 @@ options:
     labels:
       description:
         - List of labels applied as a prompt, assuming job template prompts for labels
+      type: list
+      elements: str
     credentials:
       description:
         - List of credentials applied as a prompt, assuming job template prompts for credentials

awx_collection/plugins/modules/workflow_job_template_node.py

@@ -172,6 +172,8 @@ options:
     labels:
       description:
         - List of labels applied as a prompt, assuming job template prompts for labels
+      type: list
+      elements: str
     timeout:
       description:
         - Timeout applied as a prompt, assuming job template prompts for timeout