Bug 1397218,1397219 - Disable unstable WebDriver tests, a=testonly

MozReview-Commit-ID: L2fcQmrWrql

testing/web-platform/meta/webdriver/tests/contexts/resizing_and_positioning.py.ini

@@ -0,0 +1,6 @@
+[resizing_and_positioning.py]
+  type: wdspec
+  [resizing_and_positioning.py::test_window_resize]
+    disabled:
+      if not debug: https://bugzilla.mozilla.org/show_bug.cgi?id=1397218
+

testing/web-platform/meta/webdriver/tests/element_click/select.py.ini

@@ -0,0 +1,4 @@
+[select.py]
+  type: wdspec
+  disabled:
+    if debug: https://bugzilla.mozilla.org/show_bug.cgi?id=1397219