Added optional settings to suppress PowerShell Extension Terminal Stopped notifications - issue#5336

[darlingtonogbuefi]

PR Summary

This PR adds a configuration option to suppress PowerShell Extension terminal crash/restart notifications.

Reference issue: Allow disabling the "The PowerShell Extension terminal has stopped" notifications #5336

Currently, when the PowerShell Extension terminal is stopped (intentionally or otherwise), VS Code repeatedly shows notifications warning that IntelliSense will not work. While useful for new users, these notifications can become noisy for experienced users who intentionally close the terminal or are already aware of the consequences—especially now that the terminal is spawned more frequently (for example, when Copilot references PowerShell code).

This change introduces a user-configurable setting that allows disabling these notifications, keeping the notification area clean without affecting functionality.

Key points

Adds a new setting to opt out of PowerShell Extension terminal stopped/restart notifications

Default behavior remains unchanged (notifications are still shown unless disabled)

Improves user experience for advanced users without impacting discoverability for new users

PR Checklist

PR has a meaningful title

Summarized changes

[NA] PR has tests

This PR is ready to merge and is not work in progress

[darlingtonogbuefi]

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