Fix #469: fix(deploy): add error handling flags to prerequisite scripts

[itniuma2026]

Description

Add set -euo pipefail error handling flags after the shebang line in both prerequisite shell scripts, and fix any unbound variable issues that may arise from the -u flag.

Component(s) Affected

• deploy/000-prerequisites - Azure subscription setup
• deploy/001-iac - Terraform infrastructure
• deploy/002-setup - OSMO control plane / Helm
• deploy/004-workflow - Training workflows
• src/training - Python training scripts
• docs/ - Documentation

Testing Performed

No tests were added with this change. Happy to add them if needed.

Documentation Impact

• No documentation changes needed
• Documentation updated in this PR
• Documentation issue filed

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