Remove the 3 new tests

tests/validation/config.json

@@ -677,21 +677,6 @@
             "referenceImage": "pbr_refraction.png"
         },
         {
-            "title": "PBR shader code coverage #1",
-            "playgroundId": "#QI7TL3#4",
-            "referenceImage": "pbr_codecoverage1.png"
-        },
-        {
-            "title": "PBR shader code coverage #2",
-            "playgroundId": "#QI7TL3#6",
-            "referenceImage": "pbr_codecoverage2.png"
-        },
-        {
-            "title": "PBR shader code coverage #3",
-            "playgroundId": "#QI7TL3#7",
-            "referenceImage": "pbr_codecoverage3.png"
-        },
-        {
             "title": "Texture cache",
             "playgroundId": "#20OAV9#237",
             "referenceImage": "texture cache.png"