[Gardening] REGRESSION(295707@main - 295715@main?): [ iOS ] http/tests/site-isolation/page-scale.html is a flaky failure.

rdar://152875769

Unreviewed test gardening.

Added a test expectation for a flaky failure test.

* LayoutTests/platform/ios/TestExpectations:

Canonical link: https://commits.webkit.org/296019@main

Author: karimiy21

LayoutTests/platform/ios/TestExpectations

@@ -7909,3 +7909,5 @@ webkit.org/b/294215 imported/blink/accessibility/link-inside-label.html [ Failur
 webkit.org/b/294222 [ Debug ] compositing/cocoa/clip-sticky-element-with-overflow-clip-on-root.html [ Crash ]
 
 webkit.org/b/294225 [ Debug ] fast/page-color-sampling/basic-fixed-container-edge-sampling.html [ Crash ]
+
+webkit.org/b/294229 http/tests/site-isolation/page-scale.html [ Pass ImageOnlyFailure ]