Add Shielded VM features to HTCondor modules

[tpdownes]

This PR adds Shielded VM (Secure Boot and other features) support to the HTCondor modules and enables it in the example blueprint used by the tutorial.

Submission Checklist

Please take the following actions before submitting this pull request.

• Fork your PR branch from the Toolkit "develop" branch (not main)
• Test all changes with pre-commit in a local branch #
• Confirm that "make tests" passes all tests
• Add or modify unit tests to cover code changes
• Ensure that unit test coverage remains above 80%
• Update all applicable documentation
• Follow Cloud HPC Toolkit Contribution guidelines #

[harshthakkar01]

nit: would be good to add more description as to what would be the impact of adding this to HTCondor module and why we need this.