assorted UI work to support the new branch field

update project to have allow branch override checkbox
add new text input for branch field
adjust show/hide for branch and playbook jt fields
make playbook field allowed to add a new option not in the dropdown
update job results ui to show branch
update prompting to support new branch field

awx/ui/client/lib/models/WorkflowJobTemplate.js

@@ -59,6 +59,7 @@ function canLaunchWithoutPrompt () {
         !launchData.ask_inventory_on_launch &&
         !launchData.ask_variables_on_launch &&
         !launchData.survey_enabled &&
+        !launchData.ask_scm_branch_on_launch &&
         launchData.variables_needed_to_start.length === 0
     );
 }