Import upstream v0.16.23, stripped

Upstream commit: 9d1c75ab68435e4417337f768291e5f947686203
Enterprise-only files removed or emptied: 63
Enterprise-only snippets removed: 118 in 50 files
Dangling module declarations removed: 5
Edits turning enterprise off: 25
Third-party code: 14 files, 0 not in THIRD-PARTY.md
Verification: clean

One snippet more than v0.16.22, in crates/common/src/auth/authentication.rs
(3, was 2).

crates/main/src/test_data.rs

@@ -57,7 +57,7 @@ pub async fn insert_test_data(server: &Server) {
             server.inner.data.queue_id_gen.generate(),
             QueueName::default(),
         );
-        assert!(qm.save_changes(server, None).await);
+        assert!(qm.save_changes(server, None, None).await);
     }
 
     for report in sample_tls_internal_reports() {
@@ -163,7 +163,7 @@ fn sample_queued_messages(blob_hashes: Vec<BlobHash>) -> Vec<Message> {
                         },
                     }),
                     flags: RCPT_DSN_SENT,
-                    orcpt: Some("rfc822;[email protected]".into()),
+                    orcpt: Some("[email protected]".into()),
                 },
             ],
             received_from_ip: std::net::IpAddr::V4(Ipv4Addr::new(192, 168, 1, 10)),