Bug 1733631 - [ci] Stop keying 'mochitest-browser-screenshots' variants by-platform, r=jmaher

Differential Revision: https://phabricator.services.mozilla.com/D128945

taskcluster/ci/test/mochitest.yml

@@ -295,19 +295,30 @@ browser-screenshots:
     loopback-video: true
     test-manifest-loader: null  # don't load tests in the taskgraph
     variants:
-        by-test-platform:
-            linux.*64/debug: ['fission', 'wayland', 'socketprocess_networking']
-            linux.*64-qr/debug: ['webrender-sw', 'fission', 'wayland', 'socketprocess_networking']
-            android-em-7.0-x86_64-qr/debug: ['webrender-sw', 'fission']
-            default: ['fission']
+        - fission
+        - socketprocess_networking
+        - wayland
+        - webrender-sw
     run-on-projects:
         by-variant:
             fission: []
+            socketprocess_networking:
+                by-test-platform:
+                    linux.*64/debug: ['mozilla-central']
+                    default: []
+            wayland:
+                by-test-platform:
+                    linux.*64/debug: ['mozilla-central']
+                    default: []
+            webrender-sw:
+                by-test-platform:
+                    linux.*64/debug: ['mozilla-central']
+                    default: []
             default:
                 by-test-platform:
                     windows7-32(?:-shippable)(?:-qr)?/opt: ['mozilla-central']
                     windows10-64(?:-shippable)(?:-qr)?/opt: ['mozilla-central']
-                    (?:windows10-64|windows7-32|linux1804-64|macosx1014-64)(?:-qr)?/opt: ['integration']
+                    (?:windows10-64|windows7-32|linux1804-64|macosx1014-64)(?:-qr)?/opt: ['autoland']
                     linux1804-64-(?:shippable)(?:-qr)?/opt: ['mozilla-central']
                     macosx.*64-shippable/opt: ['mozilla-central']
                     default: []