enforcePhoneAccounts should unregister unresolvable accts

Accounts that cannot be resolved anymore should be unregistered to avoid
keeping the unusable account in memory.

Flag: com.android.server.telecom.flags.unregister_unresolvable_accounts
Fixes: 281061708
Test: e2e tests + unit tests + manual:
	(1) flash apk that registers accts on diff CS's
        (2) register MAX accts and disable CS
        (3) app should repeat step 2 mutliple times
        observe/expect: accts unregistered after disabling CS and
                registering another acct
Change-Id: I57ddbef96cb56cd5e2349825123fe099ce0df106
diff --git a/flags/Android.bp b/flags/Android.bp
index d60a5f5..45acacf 100644
--- a/flags/Android.bp
+++ b/flags/Android.bp
@@ -42,5 +42,6 @@
         "telecom_remote_connection_service.aconfig",
         "telecom_profile_user_flags.aconfig",
         "telecom_bluetoothdevicemanager_flags.aconfig",
+        "telecom_non_critical_security_flags.aconfig",
     ],
 }