Bug 1893417 - pass the system-symbols task id to upload_symbols in system-symbols-upload r=gsvelto

This will allow system-symbols-upload to cope with the system-symbols task
generating multiple archives.

Differential Revision: https://phabricator.services.mozilla.com/D208745

taskcluster/kinds/system-symbols-upload/kind.yml

@@ -28,7 +28,7 @@ jobs:
                 SYMBOL_SECRET: "project/releng/gecko/build/level-{level}/gecko-symbol-upload"
         run:
             using: mach
-            mach: {artifact-reference: "python toolkit/crashreporter/tools/upload_symbols.py <system-symbols/public/build/target.crashreporter-symbols.zip> --ignore-missing"}
+            mach: {task-reference: "python toolkit/crashreporter/tools/upload_symbols.py --task-id <system-symbols> --ignore-missing"}
             sparse-profile: upload-symbols
         scopes:
             - secrets:get:project/releng/gecko/build/level-{level}/gecko-symbol-upload