chore: Clean up cloud-unsafe-op logic in admin-cli

[kensimon]

Description

We were writing the same error message over and over, just make it a CarbideCliError variant instead. Also, drop the unnecessary instance::common::GlobalOptions struct because it's totally redundant to the existing RuntimeContext struct.

This also fixes a bug where you'd type --cloud-unsafe-op="my_username" and it would end up logging "Unsafe cloud operation performed by: enabled" instead of the username you typed.

Type of Change

• Add - New feature or capability
• Change - Changes in existing functionality
• Fix - Bug fixes
• Remove - Removed features or deprecated functionality
• Internal - Internal changes (refactoring, tests, docs, etc.)

Related Issues (Optional)

Breaking Changes

• This PR contains breaking changes

Testing

• Unit tests added/updated
• Integration tests added/updated
• Manual testing performed
• No testing required (docs, internal refactor, etc.)

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