Bug 1535370 - Fix NSS CI for old branches [3.43] r=jcj

A fold of two original patches:

  Bug 1535370 - use schedulerId nss-level-{level}; r=jcj
  Bug 1535370 - drop unnecessary queue:route:notify.. route from decision task; r=jcj

Reviewers: mt, jcj

Reviewed By: jcj

Subscribers: jcj

Bug #: 1535370

Differential Revision: https://phabricator.services.mozilla.com/D23544
Differential Revision: https://phabricator.services.mozilla.com/D23545

--HG--
branch : NSS_3_43_BRANCH
extra : transplant_source : %F8%C7%3E%2B%1Bns%EB%BDj%97E%D7%DBx%B62%5DP%CF
extra : histedit_source : 63a613b9b60d4cb85da044511a0ca89ba4fedb52

.taskcluster.yml

@@ -24,7 +24,7 @@ tasks:
     in:
       taskId: '${ownTaskId}'
       taskGroupId: '${ownTaskId}'
-      schedulerId: 'gecko-level-nss'
+      schedulerId: 'nss-level-${repository.level}'
       created: {$fromNow: ''}
       deadline: {$fromNow: '1 day'}
       expires: {$fromNow: '14 days'}
@@ -41,7 +41,6 @@ tasks:
 
       scopes:
         - 'assume:repo:${repoUrl[8:]}:branch:default'
-        - 'queue:route:notify.email.${ownerEmail}.*'
       tags:
         createdForUser: "${ownerEmail}"