Bug 1717551 - Port bug 1715515: Switch windows 7 tests to -qr workers. rs=bustage-fix

Surely this is not the best fix.

Differential Revision: https://phabricator.services.mozilla.com/D118426

--HG--
extra : amend_source : 8fcaba03d334de191c978c438c666aebe2d756b9

taskcluster/ci/test/kind.yml

@@ -22,6 +22,7 @@ jobs-from:
 
 # These apply to all included test yml files listed in jobs-from
 job-defaults:
+    webrender: false
     optimization:
         skip-suite-only: null
     fetches:

taskcluster/ci/test/test-platforms.yml

@@ -56,7 +56,7 @@ linux1804-64-tsan/opt:
 # Windows platforms (matching /windows.*/)
 
 # win32
-windows7-32/opt:
+windows7-32-qr/opt:
     build-platform: win32/opt
     test-sets:
         - gtest-tests
@@ -64,7 +64,7 @@ windows7-32/opt:
         - mochitest-tests
         - xpcshell-tests
 
-windows7-32-shippable/opt:
+windows7-32-shippable-qr/opt:
     build-platform: win32-shippable/opt
     test-sets:
         - gtest-tests
@@ -72,7 +72,7 @@ windows7-32-shippable/opt:
         - mochitest-tests
         - xpcshell-tests
 
-windows7-32/debug:
+windows7-32-qr/debug:
     build-platform: win32/debug
     test-sets:
         - gtest-tests