Support breakpoints in untitled files in WinPS

[jborean93]

PR Summary

Adds support for setting breakpoints in untitled/unsaved files for Windows PowerShell 5.1. This aligns the breakpoint validation behaviour with the PowerShell 7.x API so that a breakpoint can be set for any ScriptBlock with a filename if it aligns with the client's filename.

PR Context

Fixes: #2243

This also means that breakpoints in untitled files will work in Windows PowerShell 5.1 and not just PowerShell 7+.

[Copilot]

Pull Request Overview

This PR adds support for setting breakpoints in untitled/unsaved files for Windows PowerShell 5.1, aligning the breakpoint validation behavior with PowerShell 7.x. This enables debugging of untitled files across all supported PowerShell versions.

• Replaced direct Set-PSBreakpoint calls with custom logic that bypasses file path validation
• Removed PowerShell Core version checks that previously limited untitled file breakpoint support
• Updated tests to verify both command and line breakpoints work in untitled files

Reviewed Changes

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

File	Description
BreakpointService.cs	Implements custom breakpoint creation logic using reflection to bypass file validation
BreakpointHandlers.cs	Removes PowerShell version checks and simplifies untitled file support logic
ConfigurationDoneHandler.cs	Removes unused dependencies and PowerShell version-specific parsing logic
DebugServiceTests.cs	Enhances test coverage with parameterized tests and removes constructor parameter

Comments suppressed due to low confidence (1)

src/PowerShellEditorServices/Services/DebugAdapter/BreakpointService.cs:21

• [nitpick] The constant name '_setPSBreakpointLegacy' uses an underscore prefix which is typically reserved for private fields, but this is a constant. Consider renaming to 'SetPSBreakpointLegacyScript' for clarity.

        private const string _setPSBreakpointLegacy = @"

[jborean93]

An example of this running in 5.1

[JustinGrote]

LGTM. For other reviewers, the reason the _runspaceContext isn't needed anymore is because reflection is used to determine which API to use at the command call and PSES no longer does the work.

@andyleejordan this does use reflection to access a private 5.1 API in that runtime, but since that is basically done and "stable" I don't see a risk here since 7+ uses the public API, and we are in "best effort" status on 5.1 anyways.