Add flag for share wifi button.

Bug: b/294487249

Test: Manual test
Change-Id: Ia63161f3658cbd6b5c9cca0a3848141d3add6658
Merged-In: Ia63161f3658cbd6b5c9cca0a3848141d3add6658

packages/SystemUI/src/com/android/systemui/flags/Flags.kt

@@ -753,4 +753,8 @@ object Flags {
     /** Enable the Compose implementation of the Quick Settings footer actions. */
     @JvmField
     val COMPOSE_QS_FOOTER_ACTIONS = unreleasedFlag("compose_qs_footer_actions")
+
+    /** Enable the share wifi button in Quick Settings internet dialog. */
+    @JvmField
+    val SHARE_WIFI_QS_BUTTON = unreleasedFlag("share_wifi_qs_button")
 }