Better Artifact Telemetry + Increase Upload chunk size (#535)

* Differentiate user-agents for better internal telemetry

* Bump chunk size from 4 to 8 MB

* Update User-Agent Strings

packages/artifact/src/internal/upload-http-client.ts

@@ -42,7 +42,10 @@ export class UploadHttpClient {
   private statusReporter: StatusReporter
 
   constructor() {
-    this.uploadHttpManager = new HttpManager(getUploadFileConcurrency())
+    this.uploadHttpManager = new HttpManager(
+      getUploadFileConcurrency(),
+      '@actions/artifact-upload'
+    )
     this.statusReporter = new StatusReporter(10000)
   }