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/services/src/task_manager/destroy_account.rs

@@ -4,7 +4,7 @@
  * SPDX-License-Identifier: AGPL-3.0-only OR LicenseRef-SEL
  */
 
-use crate::task_manager::TaskResult;
+use crate::task_manager::{TaskResult, deferred_retry_time};
 use common::Server;
 use email::{message::metadata::MessageMetadata, sieve::SieveScript};
 use groupware::file::FileNode;
@@ -39,7 +39,7 @@ impl DestroyAccountTask for Server {
         match destroy_account(self, task).await {
             Ok(result) => result,
             Err(err) => {
-                let result = TaskResult::temporary(err.to_string());
+                let result = TaskResult::deferred(deferred_retry_time(&err), err.to_string());
                 trc::error!(
                     err.account_id(task.account_id.document_id())
                         .details("Failed to destroy account")