Fix docfx path bug

[gewarren]

• Fixes [RedirectionVerifier] Action expects redirect when renaming a GitHub workflow in docs-maui repo #722
• Removes what's new docs exclusion logic since we don't publish what's new in docs docs anymore (introduced in Add what's new config parsing and general improvements #17)

[Copilot]

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Pull request overview

This PR fixes the DocFX path-scoping issue described in #722 by making file glob patterns account for the directory where docfx.json is found, and removes the legacy “What’s new” exclusion logic since those docs are no longer published.

Changes:

• Capture the directory where a configuration file is discovered and use it to scope DocFX matcher include patterns correctly for docfx.json in subfolders.
• Remove the .whatsnew.json configuration models/reader and stop filtering redirect checks based on “What’s new” directories.
• Minor code modernizations/cleanups and NuGet source updates.

File summaries

File	Description
actions/docs-verifier/src/RedirectionVerifier/WhatsNewConfigurationReader.cs	Removed obsolete “What’s new” config reader.
actions/docs-verifier/src/RedirectionVerifier/WhatsNewConfiguration.cs	Removed obsolete “What’s new” config model.
actions/docs-verifier/src/RedirectionVerifier/NavigationOptions.cs	Removed obsolete navigation options model used for “What’s new”.
actions/docs-verifier/src/RedirectionVerifier/RedirectionVerifier.csproj	Adds a package reference (reviewed for necessity).
actions/docs-verifier/src/RedirectionVerifier/RedirectionsVerifier.cs	Small refactor + comment/docstring formatting adjustments.
actions/docs-verifier/src/RedirectionVerifier/RedirectionHelpers.cs	Simplifies redirection file name fallback logic.
actions/docs-verifier/src/RedirectionVerifier/OpenPublishingRedirectionReader.cs	Minor pattern-matching simplification.
actions/docs-verifier/src/RedirectionVerifier/OpenPublishingConfigReader.cs	Minor pattern-matching simplification.
actions/docs-verifier/src/RedirectionVerifier/DocfxConfigurationReader.cs	Passes config directory into matcher construction.
actions/docs-verifier/src/RedirectionVerifier/DocfxConfiguration.cs	Implements “effective source” logic to fix DocFX glob scoping for subfolder docfx.json.
actions/docs-verifier/src/BuildVerifier.IO.Abstractions/BaseConfigurationReader.cs	Records the directory where the config file was found.
actions/docs-verifier/src/ActionRunner/Program.cs	Removes “What’s new” filtering and modernizes string slicing / list creation.
actions/docs-verifier/nuget.config	Adds an additional NuGet package source.

Review details

Suppressed comments (2)

actions/docs-verifier/src/RedirectionVerifier/DocfxConfiguration.cs:50

• When content.Files is null, the matcher includes "**" without the effectiveSource prefix. For docfx.json located in a subdirectory (the #722 scenario), this will match files outside the docs folder again (e.g., .github/workflows). Scope the default include to effectiveSource.

                else
                {
                    matcher.AddInclude("**");
                }

actions/docs-verifier/src/RedirectionVerifier/RedirectionsVerifier.cs:37

• The TODO comment ends with "variable?." (question mark + period). Fix the punctuation so the comment reads cleanly.

        // TODO: Verify file existence if it starts with "/<our_docset>".
        // Will this require setting the docset as an env variable?.

• Files reviewed: 13/13 changed files
• Comments generated: 4
• Review effort level: Lite

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