Migrate from s3 sdk v2 to v3 (#6731)

* chore: migrate from s3 sdk v2 to v3

* import signature-v4-crt

* downgrade minor version

* Add s3-presigned-post manually

* Change s3 mock

* Update server/storage/files/S3Storage.ts

* docs

* Upgrade aws-sdk

---------

Co-authored-by: Tom Moor <tom.moor@gmail.com>

server/index.ts

@@ -4,7 +4,6 @@ import env from "./env";
 
 import "./logging/tracer"; // must come before importing any instrumented module
 
-import maintenance from "aws-sdk/lib/maintenance_mode_message";
 import http from "http";
 import https from "https";
 import Koa from "koa";
@@ -28,9 +27,6 @@ import RedisAdapter from "./storage/redis";
 import Metrics from "./logging/Metrics";
 import { PluginManager } from "./utils/PluginManager";
 
-// Suppress the AWS maintenance message until upgrade to v3.
-maintenance.suppress = true;
-
 // The number of processes to run, defaults to the number of CPU's available
 // for the web service, and 1 for collaboration during the beta period.
 let webProcessCount = env.WEB_CONCURRENCY;