Allow override the suppress Overlay condition

Create interface for allowing the #shouldSuppressOverlay() method could
be overrided by different implementation.

Bug: 358473717
Flag: com.android.systemui.override_suppress_overlay_condition
Test: atest ClipboardListenerTest
Change-Id: Iaa3b518820a923537968c4c67cf047bcb77b9b50
diff --git a/packages/SystemUI/aconfig/systemui.aconfig b/packages/SystemUI/aconfig/systemui.aconfig
index a9d4c89..d98b05d 100644
--- a/packages/SystemUI/aconfig/systemui.aconfig
+++ b/packages/SystemUI/aconfig/systemui.aconfig
@@ -1424,6 +1424,13 @@
 }
 
 flag {
+   name: "override_suppress_overlay_condition"
+   namespace: "systemui"
+   description: "Allow override the conditions to suppress the clipboard overlay"
+   bug: "358473717"
+}
+
+flag {
    name: "media_projection_dialog_behind_lockscreen"
    namespace: "systemui"
    description: "Ensure MediaProjection Dialog appears behind the lockscreen"