hide workflow runners behind createWorker

Also renames legacy and default workflow runners.

Signed-off-by: Brian Fletcher <brian@roadie.io>

plugins/scaffolder-backend/sample-templates/all-templates.yaml

@@ -6,7 +6,6 @@ metadata:
 spec:
   targets:
     - ./remote-templates.yaml
-
 # For local development of a template, you can reference your local templates here.
 # Examples:
 #

plugins/scaffolder-backend/sample-templates/bitbucket-demo/template/catalog-info.yaml

@@ -1,8 +1,8 @@
 apiVersion: backstage.io/v1alpha1
 kind: Component
 metadata:
-  name: {{cookiecutter.name | jsonify}}
+  name: { { cookiecutter.name | jsonify } }
 spec:
   type: website
   lifecycle: experimental
-  owner: {{cookiecutter.owner | jsonify}}
+  owner: { { cookiecutter.owner | jsonify } }