Fixes#10235
This commit updates the Cobra command logic around extension upgrade checks to be non-blocking.
Previously, we were waiting for 1 second after the extension completed to allow the update checking logic complete, however users want the GitHub CLI to run as far as possible.
After merging in upstream changes regarding local extensions, this commit addresses remaining PR feedback while also bringing the newly merged tests into alignment with other changes.
- this was something I did in the original implementation of this improved extension update notification logic
- discovering other parts of the extension manager code that were working with non-prefixed extension names motivated a different approach
- the extension manager code that requires the extension be prefixed has been enhanced to use the centralized ensurePrefixed() logic, making the need for this on the extension unnecessary
This commit allows for stubbing/mocking the function used for checking update release info. Additionally, this does a minor refactor moving from non-blocking to blocking channel.
This commit expands upon the previous work by creating tests around extension command execution and how various extension update scenarios are handled.
Along the way, the logic handling formatting update messaging has been switched to use `ColorScheme` in order to honor color behavior flags.
