treewide: move build helper to more fitting places

Change-Id: I3d0cfe9283222d403ae369ec9db09201ad511e15
Reviewed-on: https://review.monogon.dev/c/monogon/+/3327
Reviewed-by: Serge Bazanski <serge@monogon.tech>
Tested-by: Jenkins CI
diff --git a/metropolis/build/kube-code-generator/boilerplate.go.txt b/metropolis/build/kube-code-generator/boilerplate.go.txt
index ef05f6f..c097ae1 100644
--- a/metropolis/build/kube-code-generator/boilerplate.go.txt
+++ b/metropolis/build/kube-code-generator/boilerplate.go.txt
@@ -1 +1 @@
-// Code generated by //metropolis/build/kubernetes-code-generator. Do not commit to source control.
+// Code generated by //osbase/build/kubernetes-code-generator. Do not commit to source control.