[Gardening]: REGRESSION (271261@main?): [ macOS ] 2 tests in inspecto…

…r/layers are flaky failures

https://bugs.webkit.org/show_bug.cgi?id=265536
rdar://118943342

Unreviewed test gardening.

Adding test expectation

* LayoutTests/platform/mac/TestExpectations:

Canonical link: https://commits.webkit.org/271292@main

LayoutTests/platform/mac/TestExpectations

@@ -2601,3 +2601,7 @@ webkit.org/b/264177 requestidlecallback/requestidlecallback-deadline-shortened-b
 webkit.org/b/264527 imported/w3c/web-platform-tests/css/css-cascade/idlharness.html [ Pass Failure ]
 
 webkit.org/b/264607 [ Sonoma+ ] css1/box_properties/acid_test.html [ Pass Timeout ]
+
+# webkit.org/b/265536 ([ macOS ] 2 tests in inspector/layers are flaky failures)
+inspector/layers/layers-compositing-reasons.html [ Pass Failure ]
+inspector/layers/layers-blending-compositing-reasons.html [ Pass Failure ]