add xfsprogs to add mkfs.xfs binary to csi-linode-node pod

[rahulait]

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There was a long standing request to support xfs filesystem within PVCs provisioned by linode-csi-driver: https://www.linode.com/community/questions/20316/create-a-persistentvolume-on-lke-with-a-different-fstype

One of the dependencies were resolved recently which added volumemode=block support: #126

However, when provisioning pvcs with fstype as xfs, it was still failing as the mkfs.xfs binary was missing from the pods.

This PR adds this binary so that one can provision PVCs with filesystem of type xfs. Here is the output from csi-linode-plugin container of csi-linode-node pod before and after adding the binary.

Before:

/ # ls /sbin/mkfs*
/sbin/mkfs.ext2  /sbin/mkfs.ext3  /sbin/mkfs.ext4  /sbin/mkfs.vfat

After:

/ # ls /sbin/mkfs*
/sbin/mkfs.ext2  /sbin/mkfs.ext3  /sbin/mkfs.ext4  /sbin/mkfs.vfat  /sbin/mkfs.xfs

Here is a sample yaml one can use to test it out with this branch:

---
apiVersion: storage.k8s.io/v1
kind: StorageClass
metadata:
  name: linode-block-storage-retain-xfs
parameters:
    fstype: xfs
provisioner: linodebs.csi.linode.com
reclaimPolicy: Retain
volumeBindingMode: Immediate
---
apiVersion: apps/v1
kind: Deployment
metadata:
  name: csi-example-pod
spec:
  strategy:
    type: Recreate
  selector:
    matchLabels:
      app: csi-example-pod
  replicas: 1
  template:
    metadata:
      labels:
        app: csi-example-pod
    spec:
      containers:
      - name: csi-example-pod
        image: busybox
        volumeMounts:
        - mountPath: "/data"
          name: csi-example-volume
        command: [ "sleep", "1000000" ]
      volumes:
      - name: csi-example-volume
        persistentVolumeClaim:
          claimName: csi-example-pvc
---
apiVersion: v1
kind: PersistentVolumeClaim
metadata:
  name: csi-example-pvc
spec:
  accessModes:
  - ReadWriteOnce
  resources:
    requests:
      storage: 10Gi
  storageClassName: linode-block-storage-retain-xfs

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2. Have you added tests?
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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 36.40%. Comparing base (e5a7c33) to head (d760709).
Report is 1 commits behind head on main.

Additional details and impacted files

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##             main     #199   +/-   ##
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  Coverage   36.40%   36.40%           
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  Files          22       22           
  Lines        1596     1596           
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  Hits          581      581           
  Misses        981      981           
  Partials       34       34           

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[komer3]

LTGM!