refactor(root): extract auth exemption logic

[masnwilliams]

TL;DR

Refactored and extracted authentication exemption logic in the root command to allow help and completion commands to run without requiring authentication.

Why we made these changes

To improve the robustness and clarity of authentication bypass logic for non-sensitive commands like help and shell completion, enhancing user experience by allowing these fundamental functions to operate without login.

What changed?

• cmd/root.go:
  • Introduced a new isAuthExempt helper function.
  • Updated the PersistentPreRunE hook to leverage isAuthExempt for determining authentication bypass for commands like help and completion.

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[mesa-dot-dev]

Performed full review of d579cf8...d34c5d9

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