Bug 1451968: Add comm-central bracnhes to taskgraph project aliases; r=dustin a=reland

There are several project aliases for taskgraph's `run_on_projects`. Add the
appropriate `comm-*` branches to those aliases.

Differential Revision: https://phabricator.services.mozilla.com/D863

--HG--
extra : source : 918004b0cc5d69f7fb05b1fcbb0adb06f6966bf0
extra : amend_source : 34414fd9ced8b73306836397e3acee26c68bb968

taskcluster/taskgraph/util/attributes.py

@@ -12,12 +12,14 @@ INTEGRATION_PROJECTS = {
     'autoland',
 }
 
-TRUNK_PROJECTS = INTEGRATION_PROJECTS | {'mozilla-central', }
+TRUNK_PROJECTS = INTEGRATION_PROJECTS | {'mozilla-central', 'comm-central'}
 
 RELEASE_PROJECTS = {
     'mozilla-central',
     'mozilla-beta',
     'mozilla-release',
+    'comm-central',
+    'comm-beta',
 }
 
 RELEASE_PROMOTION_PROJECTS = {