🌟 enhancement(VSecM): helm template changes

[v0lkan]

This PR introduces the ability for VSecM Safe to use a persistent volume if provided.

There are also additional variable renames and refactorings to make the code clearer.

In addition, certain missing environment variables have been added to Helm charts and certain environment variables that were not being used (and appear to have been mistakenly injected) to containers have been removed.

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