CLI update notification shows prerelease versions as available updates

[hacetin]

Describe the bug

The Copilot CLI status bar displays v1.0.12-1 available as an update prompt, even though v1.0.12-1 is a prerelease version. Prerelease versions should not be surfaced to users on the stable release
channel.

Affected version

v1.0.11

Steps to reproduce the behavior

1. Run Copilot CLI on v1.0.11 release
2. Observe the status bar at the bottom of the terminal

Expected behavior

The update notification should only show stable (non-prerelease) versions. Prerelease versions should be excluded from the update check unless the
user has opted into a prerelease channel

Additional context

No response

[devm33]

Hi @hacetin, GitHub and Microsoft staff are opted-in to pre-release updates by default to help with dogfooding (appreciate your help!). You can opt out by setting

   "autoUpdatesChannel": "stable"

in your .copilot/config.json