Bug 1544761 Move tp6 tests to Tier 1 r=rwood

Differential Revision: https://phabricator.services.mozilla.com/D28053

--HG--
extra : moz-landing-system : lando

taskcluster/ci/test/raptor.yml

@@ -194,7 +194,6 @@ raptor-tp6-8-firefox:
     try-name: raptor-tp6-8-firefox
     treeherder-symbol: Rap(tp6-8)
     run-on-projects: ['try', 'mozilla-central']
-    tier: 2
     mozharness:
         extra-options:
             - --test=raptor-tp6-8
@@ -216,7 +215,6 @@ raptor-tp6-9-firefox:
     try-name: raptor-tp6-9-firefox
     treeherder-symbol: Rap(tp6-9)
     run-on-projects: ['try', 'mozilla-central']
-    tier: 2
     mozharness:
         extra-options:
             - --test=raptor-tp6-9
@@ -238,7 +236,6 @@ raptor-tp6-10-firefox:
     try-name: raptor-tp6-10-firefox
     treeherder-symbol: Rap(tp6-10)
     run-on-projects: ['try', 'mozilla-central']
-    tier: 2
     mozharness:
         extra-options:
             - --test=raptor-tp6-10
@@ -260,7 +257,6 @@ raptor-tp6-binast-1-firefox:
     try-name: raptor-tp6-binast-1
     treeherder-symbol: Rap(tp6-b-1)
     run-on-projects: ['try', 'mozilla-central']
-    tier: 2
     mozharness:
         extra-options:
             - --test=raptor-tp6-binast-1