test: run enrolment tests serially

Author: russellwheatley

e2eTest/FirebaseSwiftUIExample/FirebaseSwiftUIExample.xcodeproj/xcshareddata/xcschemes/FirebaseSwiftUIExample.xcscheme

@@ -28,7 +28,25 @@
       selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
       selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
       shouldUseLaunchSchemeArgsEnv = "YES"
-      shouldAutocreateTestPlan = "YES">
+      shouldAutocreateTestPlan = "YES"
+      codeCoverageEnabled = "NO"
+      onlyGenerateCoverageForSpecifiedTargets = "NO">
+      <TestPlans>
+      </TestPlans>
+      <Testables>
+         <TestableReference
+            skipped = "NO"
+            parallelizable = "NO"
+            testExecutionOrdering = "random">
+            <BuildableReference
+               BuildableIdentifier = "primary"
+               BlueprintIdentifier = "46F89C412D64A86D000F8BC0"
+               BuildableName = "FirebaseSwiftUIExampleUITests.xctest"
+               BlueprintName = "FirebaseSwiftUIExampleUITests"
+               ReferencedContainer = "container:FirebaseSwiftUIExample.xcodeproj">
+            </BuildableReference>
+         </TestableReference>
+      </Testables>
    </TestAction>
    <LaunchAction
       buildConfiguration = "Debug"