Test-based fixes to launch config password handling

Fix bug creating WFJT schedule with passwords:
discard survey_passwords field if given in WFJT
prompts processing method.
Fixed by porting prior JT fix to WFJT method of
same name.

Fix bug where API browser will show encrypted form
of variables in the POST submission box after
failed attempt:
copy extra_data so encrypted data values are not
added in still-linked request.data

Fix a bug where submitted extra_data $encrypted$ string
literal was saved because survey_passwords was empty
when there was no diff from prior.

Allow not answering required password questions with a
non-empty default value when saving a launch config.
The literal $encrypted$ string now gets passed into the
prompts / survey validator.

awx/main/models/workflow.py

@@ -371,23 +371,28 @@ class WorkflowJobTemplate(UnifiedJobTemplate, WorkflowJobOptions, SurveyJobTempl
         return workflow_job
 
     def _accept_or_ignore_job_kwargs(self, _exclude_errors=(), **kwargs):
-        prompted_fields = {}
-        rejected_fields = {}
-        accepted_vars, rejected_vars, errors_dict = self.accept_or_ignore_variables(kwargs.get('extra_vars', {}))
+        exclude_errors = kwargs.pop('_exclude_errors', [])
+        prompted_data = {}
+        rejected_data = {}
+        accepted_vars, rejected_vars, errors_dict = self.accept_or_ignore_variables(
+            kwargs.get('extra_vars', {}),
+            _exclude_errors=exclude_errors,
+            extra_passwords=kwargs.get('survey_passwords', {}))
         if accepted_vars:
-            prompted_fields['extra_vars'] = accepted_vars
+            prompted_data['extra_vars'] = accepted_vars
         if rejected_vars:
-            rejected_fields['extra_vars'] = rejected_vars
+            rejected_data['extra_vars'] = rejected_vars
 
         # WFJTs do not behave like JTs, it can not accept inventory, credential, etc.
         bad_kwargs = kwargs.copy()
         bad_kwargs.pop('extra_vars', None)
+        bad_kwargs.pop('survey_passwords', None)
         if bad_kwargs:
-            rejected_fields.update(bad_kwargs)
+            rejected_data.update(bad_kwargs)
             for field in bad_kwargs:
                 errors_dict[field] = _('Field is not allowed for use in workflows.')
 
-        return prompted_fields, rejected_fields, errors_dict
+        return prompted_data, rejected_data, errors_dict
 
     def can_start_without_user_input(self):
         return not bool(self.variables_needed_to_start)