[ci] Vendor linstor-csi

[astef]

Description

I've vendored it like that:

LINSTOR_CSI_GITREPO=https://github.com/linbit/linstor-csi           
LINSTOR_CSI_VERSION=98544cadb6d111d27a86a11ec07de91b99704b82        
cd ./images/linstor-csi
git clone $LINSTOR_CSI_GITREPO ./src/
git reset --hard $LINSTOR_CSI_VERSION
git apply ./../patches/*.patch
rm -rf ./.git

Why do we need it, and what problem does it solve?

We'll be able to change the source code for migration purposes

What is the expected result?

At this point, it should just work as before.

Checklist

• Changes were tested in the Kubernetes cluster manually.