Add collection setting toggle to UI

Additional API housekeeping, removing unused code

Treat default branch as no branch provided

awx/main/models/jobs.py

@@ -399,6 +399,10 @@ class JobTemplate(UnifiedJobTemplate, JobOptions, SurveyJobTemplateMixin, Resour
                 # no-op case: Fields the same as template's value
                 # counted as neither accepted or ignored
                 continue
+            elif field_name == 'scm_branch' and old_value == '' and self.project and new_value == self.project.scm_branch:
+                # special case of "not provided" for branches
+                # job template does not provide branch, runs with default branch
+                continue
             elif getattr(self, ask_field_name):
                 # Special case where prompts can be rejected based on project setting
                 if field_name == 'scm_branch':

awx/main/tasks.py

@@ -702,8 +702,7 @@ class BaseTask(object):
     abstract = True
     proot_show_paths = []
 
-    def __init__(self, *args, **kwargs):
-        super(BaseTask, self).__init__(*args, **kwargs)
+    def __init__(self):
         self.cleanup_paths = []
 
     def update_model(self, pk, _attempt=0, **updates):

awx/playbooks/project_update.yml

@@ -137,7 +137,6 @@
       delegate_to: localhost
 
     - block:
-      # TODO: don't run this if ansible verison doens't support collections
       - name: detect collections/requirements.yml
         stat: path={{project_path|quote}}/collections/requirements.yml
         register: doesCollectionRequirementsExist

awx/ui/client/src/configuration/forms/jobs-form/configuration-jobs.form.js

@@ -61,6 +61,9 @@ export default ['i18n', function(i18n) {
             AWX_ROLES_ENABLED: {
                 type: 'toggleSwitch',
             },
+            AWX_COLLECTIONS_ENABLED: {
+                type: 'toggleSwitch',
+            },
             AWX_TASK_ENV: {
                 type: 'textarea',
                 reset: 'AWX_TASK_ENV',