Add --artifacts-path support to dotnet test in MTP mode

[Copilot]

dotnet test in Microsoft Testing Platform (MTP) mode was missing the --artifacts-path option that VSTest mode and all other MSBuild-integrated commands (build, restore, publish, etc.) support.

Changes

• TestCommandDefinition.MicrosoftTestingPlatform.cs: Added ArtifactsPathOption via CommonOptions.CreateArtifactsPathOption() — the same factory used by VSTest and build commands. The option uses ForwardAsSingle() to automatically translate --artifacts-path <path> → --property:ArtifactsPath=<absolute-path> forwarded to MSBuild through the existing OptionValuesToBeForwarded() path in MSBuildUtility.GetBuildOptions(). No additional parsing logic needed.

• MTPHelpSnapshotTests.VerifyMTPHelpOutput.verified.txt: Updated help output snapshot to include --artifacts-path <ARTIFACTS_DIR> and corrected line-wrapping to match current terminal width.

Usage

- name: 🧪 Test
  run: dotnet test --configuration Release --no-build --artifacts-path ${{ env.ARTIFACTS_PATH }}

Original prompt

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This section details on the original issue you should resolve

<issue_title>dotnet test mtp lost --artifacts-path</issue_title>
<issue_description>### Describe the bug
dotnet test in MTP mode doesn't support the --artifacts-path option that was supported in VStest mode, and supported by other dotnet commands.

To Reproduce

See the below pipeline. I expect to be able to use --artifacts-path ${{ env.ARTIFACTS_PATH }} on the test command like I could in VS test mode, and like I can on other commands. Instead I have to work around by specifying --p:ArtifactsPath=${{ env.ARTIFACTS_PATH }} instead.

jobs:
  build:
    name: 🏗️ Build and test
    runs-on: ubuntu-latest

    env:
      ARTIFACTS_PATH: ${{ github.workspace }}/blahblahblah/

   steps:
      - name: 📥 Restore dependencies
        id: restore
        run: dotnet restore --artifacts-path ${{ env.ARTIFACTS_PATH }} -bl:${{ env.BINLOG_PATH }}/restore.binlog

      - name: 🏗️ Build
        id: build
        run: dotnet build --configuration ${{ inputs.configuration }} --no-restore --artifacts-path ${{ env.ARTIFACTS_PATH }} -bl:${{ env.BINLOG_PATH }}/build.binlog

      - name: 🧪 Test
        id: test
        run: dotnet test --configuration ${{ inputs.configuration }} --no-build --artifacts-path ${{ env.ARTIFACTS_PATH }} -bl:${{ env.BINLOG_PATH }}/test.binlog --output Detailed --results-directory ${{ env.TESTRESULTS_PATH }}

Exceptions (if any)

Further technical details

details of dotnet --info

- The IDE (VS / VS Code/ VS4Mac) you're running on, and its version

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

@Youssef1313 Thanks for bringing this to our attention. We should indeed implement this for MTP dotnet test.

• Fixes dotnet test mtp lost --artifacts-path #53204

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[Copilot]

Pull request overview

Adds missing --artifacts-path support to dotnet test when running in Microsoft Testing Platform (MTP) mode, aligning it with VSTest mode and other MSBuild-integrated dotnet commands.

Changes:

• Added ArtifactsPathOption to the MTP dotnet test command definition via CommonOptions.CreateArtifactsPathOption() (MSBuild-forwarded as ArtifactsPath with absolute path normalization).
• Updated the MTP help output snapshot to include the new --artifacts-path <ARTIFACTS_DIR> option.

Reviewed changes

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

File	Description
src/Cli/Microsoft.DotNet.Cli.Definitions/Commands/Test/TestCommandDefinition.MicrosoftTestingPlatform.cs	Registers the standard --artifacts-path option in MTP mode so it forwards into MSBuild like other commands.
test/dotnet.Tests/CommandTests/Test/snapshots/MTPHelpSnapshotTests.VerifyMTPHelpOutput.verified.txt	Updates the verified help snapshot to reflect the newly available option.