Fix nullability compiler errors from NuGet 7.6 API changes

[Copilot]

NuGet 7.6.0-rc.16321 added nullable annotations to IPackageSearchMetadata.LicenseMetadata (LicenseMetadata?) and LicenseMetadata.LicenseExpression (NuGetLicenseExpression?), causing CS8602 errors in FakeItEasy mock chain expressions in TemplatePackageCoordinatorTests.cs.

Change

Added null-forgiving operators to the four affected mock setup expressions:

// Before
A.CallTo(() => searchMetadata.LicenseMetadata.LicenseExpression.ToString()).Returns("MIT");

// After
A.CallTo(() => searchMetadata.LicenseMetadata!.LicenseExpression!.ToString()).Returns("MIT");

Consistent with the companion fix already applied in NugetApiManager.cs (backflow commit) which used ?. when reading LicenseExpression in production code.

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[Copilot]

Just as a heads up, I was blocked by some firewall rules while working on your feedback. Expand below for details.

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• dev.azure.com
  • Triggering command: /home/REDACTED/work/_temp/ghcca-node/node/bin/node /home/REDACTED/work/_temp/ghcca-node/node/bin/node --enable-source-maps /home/REDACTED/work/_temp/copilot-developer-action-main/dist/index.js (dns block)
  • Triggering command: /usr/bin/curl curl -s REDACTED bash --no�� --noprofile adManifestReader/Microsoft.NET.Sdk.WorkloadManifestReader.csproj de/node/bin/grep (dns block)
  • Triggering command: /usr/bin/curl curl -v REDACTED bash --no�� semblies\|ComputeWasmBuildAssets et-format/dotnet-format.csproj de/node/bin/grep k/sdk/sdk/src/Webash nAndConfigFiles.--norc k/sdk/sdk/src/Wo--noprofile k/sdk/sdk/src/Workloads/Manifest/home/REDACTED/work/sdk/sdk/src/Dotnet.Watch/Watch.Aspire/Microsoft.DotNet.HotReload.Watch.Aspire.csproj k/sd�� k/sdk/sdk/src/Layout/redist/redist.csproj loadAgent.Data/Microsoft.DotNet.HotReload.Agent.Data.Package.csproj (dns block)
• https://api.github.com/graphql
  • Triggering command: /usr/bin/gh /usr/bin/gh pr checks 53350 --repo dotnet/sdk rapper/Microsoft.DotNet.NativeWrapper.csproj de/node/bin/grep .Tool.csproj .NetAnalyzers.cs--no-pager (http block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)