Add Foundry project environment variables

[alliscode]

Motivation & Context

Description & Review Guide

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Related Issue

Fixes #

Contribution Checklist

• The code builds clean without any errors or warnings
• All unit tests pass, and I have added new tests where possible
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[Copilot]

Pull request overview

This PR updates the .NET sample verification GitHub Actions workflow to pass Azure AI Foundry (Foundry) configuration via environment variables so the dotnet/eng/verify-samples runner can enable AI-powered verification when configured.

Changes:

• Add FOUNDRY_PROJECT_ENDPOINT to the Run verify-samples step environment.
• Add FOUNDRY_MODEL to the Run verify-samples step environment.

Show a summary per file

File	Description
.github/workflows/dotnet-verify-samples.yml	Exposes Foundry endpoint/model settings to the verify-samples runner via workflow env.

Copilot's findings

• Files reviewed: 1/1 changed files
• Comments generated: 1

[github-actions]

Automated Code Review

Reviewers: 5 | Confidence: 95% | Result: All clear

Reviewed: Correctness, Security Reliability, Test Coverage, Failure Modes, Design Approach

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Automated review by alliscode's agents