Add CodeQL comments to clarify trusted input handling in ResourcesGen…

[gpaskaleva-msft]

Adds a suppression comment for CodeQL finding SM00414.

After investigation, the reported data flows were determined to be build-time only and originate from trusted MSBuild inputs (ITaskItem.ItemSpec values such as ResourceFiles, OutputResourcesFile, and _markupFiles). These values are supplied by the project file and build items authored by the developer performing the build, not by untrusted external users or runtime application input.

This area can be re-evaluated in the future if these tasks begin accepting untrusted or externally supplied input.

Microsoft Reviewers: Open in CodeFlow

[Copilot]

Pull request overview

This PR adds inline CodeQL suppression/justification comments for rule SM00414 in WPF build tasks, documenting that the flagged file-path flows originate from developer-authored MSBuild items (build-time inputs), rather than runtime/untrusted user input.

Changes:

• Annotates File.OpenRead(inputFile.ItemSpec) call sites in UidManager with CodeQL SM00414 trusted-input justification.
• Annotates file deletion/existence checks in UidManager.RemoveFile with CodeQL SM00414 trusted-input justification.
• Annotates resource file existence validation in ResourcesGenerator.ValidResourceFiles with CodeQL SM00414 trusted-input justification.

Reviewed changes

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

File	Description
src/Microsoft.DotNet.Wpf/src/PresentationBuildTasks/Microsoft/Build/Tasks/Windows/UidManager.cs	Adds CodeQL SM00414 suppress/justify comments on build-time file IO (read/delete/move) paths derived from MSBuild items.
src/Microsoft.DotNet.Wpf/src/PresentationBuildTasks/Microsoft/Build/Tasks/Windows/ResourcesGenerator.cs	Adds CodeQL SM00414 suppress/justify comment on resource file existence checks using MSBuild ItemSpec-derived paths.

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[himgoyalmicro]

LGTM

[harshit7962]

The comments by copilot are not fully valid, but I think we should truncate the reasoning that we have provided. It should be a minimum of 25 chars as per the rules but if copilot suggest that analyzer will find it difficult to read, then we should consider truncating it.