The PR makes the following changes to the H4D blueprint:

1> Disable automatic updates to prevent unattended updates leading to unstable clusters.

2> Explicitly mention the image used for nodeset, controller and login nodes within the blueprint instead of relying solely on the default in CTK.

3> Removes duplicate file store "appfs". There's no benefit of having two separate file store instances in the base blueprint. There are probably use cases of using separate file stores for specific apps but is not a general practice and hence needs to be removed.

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