Revert int.worker to worker (#8126)

- Prevent existing docker compose installs from breaking

docs/docs/start/bare_dev.md

@@ -52,7 +52,7 @@ source ./env/bin/activate
 ### Start Background Worker
 
 ```
-(env) invoke int.worker
+(env) invoke worker
 ```
 
 This will start the background process manager in the current shell.

docs/docs/start/docker_install.md

@@ -247,7 +247,7 @@ index 8adee63..dc3993c 100644
 -        image: inventree/inventree:${INVENTREE_TAG:-stable}
 +        image: inventree/inventree:${INVENTREE_TAG:-stable}-custom
 +        pull_policy: never
-         command: invoke int.worker
+         command: invoke worker
          depends_on:
              - inventree-server
 ```