Bug 1669478 - Enable WebRender on most of the windows10-64 ccov tests. r=ahal,jrmuizel

This moves most of the windows ccov tests to run with WebRender enabled by
putting them in the windows10-64-ccov-qr test platform. (The -qr suffix causes
the taskgraph code to enable WebRender for these jobs).
The only one skipped is the marionette GPU test because it contains a test that
specifically requires WebRender disabled.

The existing non-regex config keys that referred to `windows10-64-ccov` also
get updated, and in a couple of places we need to add a new non-regex key to
disambiguate between two matching regex keys.

Differential Revision: https://phabricator.services.mozilla.com/D94769

taskcluster/taskgraph/transforms/tests.py

@@ -109,6 +109,11 @@ WINDOWS_WORKER_TYPES = {
         "virtual-with-gpu": "t-win10-64-gpu-s",
         "hardware": "t-win10-64-1803-hw",
     },
+    "windows10-64-ccov-qr": {
+        "virtual": "t-win10-64",
+        "virtual-with-gpu": "t-win10-64-gpu-s",
+        "hardware": "t-win10-64-1803-hw",
+    },
     "windows10-64-devedition": {
         "virtual": "t-win10-64",
         "virtual-with-gpu": "t-win10-64-gpu-s",