[Gardening]: [Sonoma H Release x86_64 EWS ] webgl/1.0.x/conformance/glsl/bugs/sampler-array-using-loop-index.html and webgl/2.0.y/conformance/glsl/bugs/sampler-array-using-loop-index.html failure

https://bugs.webkit.org/show_bug.cgi?id=288642
rdar://145685582

Unreviewed test gardening

Skipping the tests after Sonoma bringup in EWS

* LayoutTests/platform/mac-wk2/TestExpectations:

Canonical link: https://commits.webkit.org/291166@main

Author: martadarbinyan

LayoutTests/platform/mac-wk2/TestExpectations

@@ -1984,3 +1984,7 @@ webkit.org/b/288603 imported/w3c/web-platform-tests/screen-orientation/hidden_do
 webkit.org/b/288613 [ Sonoma+ ] pdf/pdf-in-embed-with-root-page-zoom.html [ Pass Timeout Failure ]
 
 webkit.org/b/288620 [ Debug ] ipc/large-vector-allocate-failure-crash.html [ Skip ]
+
+# webkit.org/b/288642 [Sonoma H Release x86_64 EWS ] webgl/1.0.x/conformance/glsl/bugs/sampler-array-using-loop-index.html and webgl/2.0.y/conformance/glsl/bugs/sampler-array-using-loop-index.html failure
+[ Sonoma Release x86_64 ] webgl/1.0.x/conformance/glsl/bugs/sampler-array-using-loop-index.html [ Skip ]
+[ Sonoma Release x86_64 ] webgl/2.0.y/conformance/glsl/bugs/sampler-array-using-loop-index.html [ Skip ]