Auto agent, unified credit system, and editor improvements

This release brings Auto, our new agent, enhanced usage tracking, and editor improvements to elevate your development experience.

Auto: Added Auto to the model options. Auto is an agent that uses a mix of different frontier models such as Sonnet 4 combined with specialized models, and optimization techniques such as intent detection, caching, and more
Unified Limits: Support for new paid plans with unified limits and fractional credit consumption
Usage Dashboard: Support to view usage based on single Kiro credit pool
Usage Meter: Add credit consumption status bar item to allow easier usage tracking

Editor Upgrade: Upgraded editor to CodeOSS 1.103.2
Account Management: Enable Kiro account deletion for BuilderID
Authentication: Improvements to login reliability and logout flow for better signing experience
UI Improvements: Hide trust command UI on command cancellation