feat(cargo-shuttle): use api-provided console url on login if available

[jonaro00]

Forward compatible change to move console url logic to the api

Also renamed a constant

[greptile-apps]

PR Summary

(updates since last review)

This PR modifies the login functionality to make the console URL configurable through the API instead of using a hardcoded constant.

• Removed SHUTTLE_CONSOLE_URL constant from imports in cargo-shuttle/src/args.rs
• Added hidden console_url field to LoginArgs struct configurable via SHUTTLE_CONSOLE environment variable
• Change enables forward compatibility for API-driven console URL management

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