Bug 1403342 - use try_job transform for source tests too; r=ahal

Just a minor refactor

MozReview-Commit-ID: 2YdOtO2sGEc

--HG--
extra : rebase_source : 04aa7cecf9de2e7bac01744f9c8b25805e77a013

taskcluster/ci/source-test/kind.yml

@@ -5,6 +5,7 @@
 loader: taskgraph.loader.transform:loader
 
 transforms:
+   - taskgraph.transforms.try_job:transforms
    - taskgraph.transforms.source_test:transforms
    - taskgraph.transforms.job:transforms
    - taskgraph.transforms.task:transforms

taskcluster/taskgraph/transforms/source_test.py

@@ -71,8 +71,6 @@ def validate(config, jobs):
 @transforms.add
 def set_job_name(config, jobs):
     for job in jobs:
-        job.setdefault('attributes', {}).setdefault('job_try_name', job['name'])
-
         if 'job-from' in job and job['job-from'] != 'kind.yml':
             from_name = os.path.splitext(job['job-from'])[0]
             job['name'] = '{}-{}'.format(from_name, job['name'])