Remove summary when failing, and double space

[nohwnd]

Mixed mode has more specific message and reports no test summary:

There is one empty line before artifacts and one before summary, instead of 2 before artifacts, and none before summary.

Fix https://devdiv.visualstudio.com/DevDiv/_workitems/edit/2397515 (help was fixed by Mariam previously).

[Copilot]

Pull Request Overview

This PR disables the test run summary for failing tests and adjusts the spacing in the terminal output.

• Disables the test run summary by invoking DisableTestRunSummary() in MSBuildHandler when tests fail.
• Adds a flag (_disableTestRunSummary) and updates the terminal output logic in TerminalTestReporter to conditionally skip the summary and include an extra empty line separating artifacts from the summary.

Reviewed Changes

Copilot reviewed 2 out of 16 changed files in this pull request and generated no comments.

File	Description
src/Cli/dotnet/commands/Test/MSBuildHandler.cs	Calls DisableTestRunSummary() to disable the summary when tests fail.
src/Cli/dotnet/commands/Test/Terminal/TerminalTestReporter.cs	Introduces _disableTestRunSummary flag and adjusts the spacing in the output to provide a double space between artifacts and the summary.

Files not reviewed (14)

• src/Cli/dotnet/commands/Test/LocalizableStrings.resx: Language not supported
• src/Cli/dotnet/commands/Test/xlf/LocalizableStrings.cs.xlf: Language not supported
• src/Cli/dotnet/commands/Test/xlf/LocalizableStrings.de.xlf: Language not supported
• src/Cli/dotnet/commands/Test/xlf/LocalizableStrings.es.xlf: Language not supported
• src/Cli/dotnet/commands/Test/xlf/LocalizableStrings.fr.xlf: Language not supported
• src/Cli/dotnet/commands/Test/xlf/LocalizableStrings.it.xlf: Language not supported
• src/Cli/dotnet/commands/Test/xlf/LocalizableStrings.ja.xlf: Language not supported
• src/Cli/dotnet/commands/Test/xlf/LocalizableStrings.ko.xlf: Language not supported
• src/Cli/dotnet/commands/Test/xlf/LocalizableStrings.pl.xlf: Language not supported
• src/Cli/dotnet/commands/Test/xlf/LocalizableStrings.pt-BR.xlf: Language not supported
• src/Cli/dotnet/commands/Test/xlf/LocalizableStrings.ru.xlf: Language not supported
• src/Cli/dotnet/commands/Test/xlf/LocalizableStrings.tr.xlf: Language not supported
• src/Cli/dotnet/commands/Test/xlf/LocalizableStrings.zh-Hans.xlf: Language not supported
• src/Cli/dotnet/commands/Test/xlf/LocalizableStrings.zh-Hant.xlf: Language not supported

[Forgind]

Can you explain why it's beneficial to skip the summary?

[nohwnd]

That case is shown in the first screenshot, and we did feel like showing the 6 more lines of summary after the error was too confusing. The run will end with an error, and technically did not even start so user is not losing much information.