test: add tracing for auto, manual update

[peppescg]

Enhanced Auto-Update Tracing with Sentry

Summary

Added comprehensive Sentry tracing for the entire auto-update lifecycle to improve observability, error tracking, and analytics.

Complete traced flow:

Manual update span.op

update.manual
├─ update.init 
  ├─ update.checking
  ├─ update.available
  ├─ update.downloaded
  ├─ update.user_decision
  └─ update.install 

Auto update span.op

update.init 
  ├─ update.checking
  ├─ update.available
  ├─ update.downloaded
  ├─ update.user_decision
  └─ update.install 

All phases are traced in Sentry with proper span hierarchy

[Copilot]

Pull Request Overview

This PR adds comprehensive Sentry tracing infrastructure to the auto-update system to improve observability and error tracking throughout the entire update lifecycle. The changes enable detailed monitoring of both automatic and manual update flows.

• Added Sentry span tracing for all auto-update phases (initialization, checking, downloading, installation)
• Restructured update handlers into separate functions with proper error handling and tracing
• Added IPC handler for manual update installation with error recovery

Reviewed Changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 2 comments.

File	Description
main/src/auto-update.ts	Major refactoring to add comprehensive Sentry tracing throughout the auto-update lifecycle with proper span hierarchy
main/src/tests/auto-update.test.ts	Added Sentry mocks for testing and updated error message assertions
main/src/main-window.ts	Removed verbose logging statements
renderer/src/common/hooks/use-mcp-secrets.ts	Removed test environment check for timeout delay