v8.0 module release (#22975)

https://mattermost.atlassian.net/browse/MM-52079

```release-note
We upgrade the module version to 8.0. The new module path is github.com/mattermost-server/server/v8.
```


Co-authored-by: Doug Lauder <wiggin77@warpmail.net>

server/scripts/setup_go_work.sh

@@ -8,13 +8,8 @@ then
     
     if [ "$BUILD_ENTERPRISE_READY" == "true" ] 
     then
-        txt="${txt}use ../enterprise\n"
+        txt="${txt}use ../../enterprise\n"
     fi
     
-    if [ "$BUILD_PLAYBOOKS" == "true" ]
-    then
-        txt="${txt}use ../mattermost-plugin-playbooks\n"
-    fi
-
-    printf "$txt" > "../go.work"
+    printf "$txt" > "go.work"
 fi