feat: Don't reveal profile data to a not yet verified contact (#5166)

Follow-up to b771311593. Since that commit names are not revealed in
verified chats, but during verification (i.e. SecureJoin) they are still sent unencrypted. Moreover,
all profile data mustn't be sent even encrypted before the contact verification, i.e. before
"v{c,g}-request-with-auth". That was done for the selfavatar in
304e902fce, now it's done for From/To names and the self-status as
well. Moreover, "v{c,g}-request" and "v{c,g}-auth-required" messages are deleted right after
processing, so other devices won't see the received profile data anyway.

src/test_utils.rs

@@ -566,18 +566,12 @@ impl TestContext {
 
     /// Returns the [`Contact`] for the other [`TestContext`], creating it if necessary.
     pub async fn add_or_lookup_contact(&self, other: &TestContext) -> Contact {
-        let name = other
-            .ctx
-            .get_config(Config::Displayname)
-            .await
-            .unwrap_or_default()
-            .unwrap_or_default();
         let primary_self_addr = other.ctx.get_primary_self_addr().await.unwrap();
         let addr = ContactAddress::new(&primary_self_addr).unwrap();
         // MailinglistAddress is the lowest allowed origin, we'd prefer to not modify the
         // origin when creating this contact.
         let (contact_id, modified) =
-            Contact::add_or_lookup(self, &name, &addr, Origin::MailinglistAddress)
+            Contact::add_or_lookup(self, "", &addr, Origin::MailinglistAddress)
                 .await
                 .expect("add_or_lookup");
         match modified {