Exit if restore/build failure in dotnet test

[mariam-abdulla]

This pull request includes changes to the GetProj and GetProjectsFromProject methods in the MSBuildUtility.cs file to improve the handling of build or restore failures. The most important changes include adding early return statements when the build or restore process fails, ensuring that an empty array is returned in such cases.

Changes to build or restore handling:

• src/Cli/dotnet/commands/dotnet-test/MSBuildUtility.cs: Added early return statements in the GetProj and GetProjectsFromProject methods to return an empty array when the build or restore process fails.

Relates to #45927
Fixes microsoft/testfx#5203

PR Overview

This PR ensures that dotnet test exits early if a restore/build failure occurs in order to prevent further processing when the build state is invalid.

• Added early exit in GetProjectsSolution if build/restore fails
• Added early return in GetProjectsFromProject on build/restore failure
• Removed aggregated status update using projects' existence to determine the build state

Reviewed Changes

File	Description
src/Cli/dotnet/commands/dotnet-test/MSBuildUtility.cs	Early exit on build/restore failure and removal of additional built state checks

Copilot reviewed 1 out of 1 changed files in this pull request and generated no comments.

Comments suppressed due to low confidence (2)

src/Cli/dotnet/commands/dotnet-test/MSBuildUtility.cs:32

• The removal of the projects emptiness check changes the behavior compared to before. Confirm that the build status should rely solely on the initial build/restore result rather than also considering whether any projects were found.

isBuiltOrRestored |= !projects.IsEmpty;

src/Cli/dotnet/commands/dotnet-test/MSBuildUtility.cs:45

• With the early return on restore/build failure, the check using projects.Any() has been removed. Verify that not updating the isBuiltOrRestored flag based on the presence of projects is the intended behavior.

IEnumerable<TestModule> projects = SolutionAndProjectUtility.GetProjectProperties(projectFilePath, GetGlobalProperties(buildOptions.BuildProperties), new ProjectCollection());