Check that pyyaml is installed

Francois Eleouetrequested to merge
fe/check-pyyaml into main

What does this MR do and why?

Check that pyyaml is installed in the system, otherwise it may silently fail and continue as as calls to /tools/extractHelmReleaseValues.py are done in if statements:

🔃 Preparing bootstrap cluster
# Warning: 'commonLabels' is deprecated. Please use 'labels' instead. Run 'kustomize edit fix' to update your Kustomization automatically.
Traceback (most recent call last):
  File "/home/labo/sylva-core/tools/extractHelmReleaseValues.py", line 7, in <module>
    import yaml
ModuleNotFoundError: No module named 'yaml'
Creating kind cluster with following config:
kind: Cluster
apiVersion: kind.x-k8s.io/v1alpha4
networking:
  podSubnet: "100.100.0.0/16"
  serviceSubnet: "100.96.0.0/16"
nodes:
  - role: control-plane
    extraMounts:
      - hostPath: /home/labo/sylva-core/tools/kind/systemd/nomasquerade.service
        containerPath: /etc/systemd/system/nomasquerade.service
      - hostPath: /home/labo/sylva-core/tools/kind/systemd/iptables.sh
        containerPath: /usr/local/bin/iptables.sh
Creating cluster "sylva" ...
⠈⠁ Ensuring node image (172.20.129.37/docker.io/kindest/node:v1.29.2)

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