Feature: Add sessionName debug setting to allow different PS for temp console

[JustinGrote]

PR Summary

We want to encourage people to use PS7 for their extension terminal, but need to give them an easy way to test and debug PowerShell 5.1 tests.

This adds a setting to enable the selection of a different PowerShell executable for the temp terminal. It also adds a launch config sample for Windows PowerShell.

Recording.2025-05-31.100611.mp4

This has the added benefit of being able to temp console other PowerShell exes, such as a latest PowerShell build.

[Copilot]

Pull Request Overview

This PR adds a new temporaryIntegratedConsoleExeName setting so users can pick a different PowerShell executable for temporary debug consoles (e.g., Windows PowerShell 5.1). It wires the new setting through the session manager, debug feature, package.json schema, and example launch configs.

• Exposed powershellExeName parameter in createDebugSessionProcess and updated selection logic
• Added WindowsPowerShell debug configuration and sample launch.json entry
• Updated package.json with schema for the new setting

Reviewed Changes

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

File	Description
src/session.ts	Added optional powershellExeName argument and logic to pick custom exe
src/features/DebugSession.ts	Introduced WindowsPowerShell enum, sample config, and propagation
package.json	Defined JSON schema for temporaryIntegratedConsoleExeName and added launch snippet
examples/.vscode/launch.json	Added example launch configuration for Windows PowerShell

Comments suppressed due to low confidence (2)

src/session.ts:737

• The defaultPowerShell variable is declared but never used. Removing this unused variable will clean up the code.

let defaultPowerShell: IPowerShellExeDetails | undefined;

src/session.ts:459

• There are no tests covering the new powershellExeName path in createDebugSessionProcess. Consider adding unit or integration tests to verify that custom executables are correctly discovered and invoked.

public async createDebugSessionProcess(