server: AbortError at lower log level

AbortErrors happen when a connection times out, which is a quite
common occurrence and not worthy of a warning level log message.

packages/backend/src/queue/index.ts

@@ -58,8 +58,16 @@ deliverQueue
 		await deletionRefCount(job);
 	})
 	.on('failed', async (job, err) => {
-		deliverLogger.warn(`failed(${err}) ${getJobInfo(job)} to=${job.data.to}`);
-		await deletionRefCount(job);
+		if (err.type === 'aborted') {
+			deliverLogger.debug(`failed(${err}) ${getJobInfo(job)} to=${job.data.to}`);
+		} else {
+			deliverLogger.warn(`failed(${err}) ${getJobInfo(job)} to=${job.data.to}`);
+		}
+
+		if (job.attemptsMade >= (job.opts?.attempts ?? 1)) {
+			// this was the last attempt
+			await deletionRefCount(job);
+		}
 	})
 	.on('error', (job: any, err: Error) => deliverLogger.error(`error ${err}`))
 	.on('stalled', (job) => deliverLogger.warn(`stalled ${getJobInfo(job)} to=${job.data.to}`));