Bug 1829615 - Disable org.mozilla.geckoview.test.SelectionActionDelegateTest#compareClientRect on fission for frequent failures. r=intermittent-reviewers,geckoview-reviewers,ahal,owlish

Differential Revision: https://phabricator.services.mozilla.com/D181341

mobile/android/geckoview/src/androidTest/java/org/mozilla/geckoview/test/SelectionActionDelegateTest.kt

@@ -341,6 +341,8 @@ class SelectionActionDelegateTest : BaseSessionTest() {
     }
 
     @Test fun compareClientRect() {
+        // TODO: Bug 1829615
+        assumeThat(sessionRule.env.isFission, equalTo(false))
         val jsCssReset = """(function() {
             document.querySelector('$id').style.display = "block";
             document.querySelector('$id').style.border = "0";