Document new dotnet test MTP command-line options

[Copilot]

SDK added four new command-line options for dotnet test with Microsoft.Testing.Platform that were undocumented.

Changes

• Added option documentation:

  • --config-file: Configuration file path for test execution
  • --results-directory: Test results output directory (auto-created, supports relative paths)
  • --diagnostic-output-directory: Diagnostic output directory (auto-created, supports relative paths)
  • --minimum-expected-tests: Minimum test count enforcement (fails with exit code 9 if unmet)

• Updated synopsis with new options in correct order

• Added examples demonstrating new options:

  dotnet test --results-directory ./TestResults
  dotnet test --diagnostic-output-directory ./Diagnostics
  dotnet test --minimum-expected-tests 10

All options note that relative paths are converted to absolute paths based on current directory.

References

Implemented in:

• SDK PR Merge main into live #50081 (--results-directory)
• SDK PR Update ca1873.md #50136 (--config-file, --diagnostic-output-directory)
• SDK PR Bump the dotnet group with 10 updates #50527 (--minimum-expected-tests)

Original prompt

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This section details on the original issue you should resolve

<issue_title>dotnet test for Microsoft.Testing.Platform: revise command-line documentation</issue_title>
<issue_description>### Describe the issue or suggestion

As we are progressing, we make changes to the CLI of the new dotnet test implementation in .NET 10.

We need to take a pass to ensure everything is documented correctly. For example, we are adding --minimum-expected-tests in dotnet/sdk#50527, we need to include it in the documentation. There might be some more changes that we made and we forgot to update the doc

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Associated WorkItem - 550424</issue_description>

<agent_instructions>Add the following options to: https://learn.microsoft.com/en-us/dotnet/core/tools/dotnet-test-mtp. --config-file, --results-directory, --diagnostic-output-directory, --minimum-expected-tests</agent_instructions>

Comments on the Issue (you are @copilot in this section)

@meaghanlewis @Youssef1313 I'm going to work on this.

Should I also add the options that are listed as done in: dotnet/sdk#49709?</comment_new>
<comment_new>@Youssef1313
@meaghanlewis Yes. The options in that issue should be documented, if they are not.</comment_new>

• Fixes dotnet test for Microsoft.Testing.Platform: revise command-line documentation #48209

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Internal previews

📄 File	🔗 Preview link
docs/core/tools/dotnet-test-mtp.md	dotnet test with Microsoft.Testing.Platform (MTP)

[Copilot]

Pull request overview

This PR documents four new command-line options for dotnet test with Microsoft.Testing.Platform that were previously undocumented in the SDK. The changes ensure the .NET 10 SDK documentation reflects the latest CLI capabilities.

Changes:

• Added documentation for --config-file, --results-directory, --diagnostic-output-directory, and --minimum-expected-tests options
• Updated the command synopsis to include the new options in logical order
• Added usage examples demonstrating three of the four new options