Settings: Create aconfig flag for search result deep links in same task

This will be used to guard the bugfix a bug where the deep link
initiated from a search result would open the results page in a separate
window.

Bug: 381127948
Test: None
Flag: com.android.settings.flags.settings_search_result_deep_link_in_same_task
Change-Id: I5a10df558130176ae9df39c0c35501def948430d

aconfig/settings_desktop_flag_declarations.aconfig

@@ -0,0 +1,12 @@
+package: "com.android.settings.flags"
+container: "system_ext"
+
+flag {
+    name: "settings_search_result_deep_link_in_same_task"
+    namespace: "desktop_personalization"
+    description: "Show the search result deep link in the same task (same window)"
+    bug: "381127948"
+    metadata {
+        purpose: PURPOSE_BUGFIX
+    }
+}