Make src/test dir for package being tested before copying test tar fi…

…les (microsoft#19491)

## Description

Follow-up to microsoft#19457: directory needs to be created before copying the
artifact's source files into it.

Co-authored-by: Abram Sanderson <absander@microsoft.com>

tools/pipelines/templates/include-test-real-service.yml

@@ -276,6 +276,7 @@ jobs:
             targetType: 'inline'
             script: |
               mkdir ${{ parameters.testWorkspace }}/node_modules/${{ parameters.testPackage }}/dist/test
+              mkdir ${{ parameters.testWorkspace }}/node_modules/${{ parameters.testPackage }}/src/test
               tar -xvf $(Pipeline.Workspace)/test-files/${{ parameters.testFileTarName }}.test-files.tar -C $(Pipeline.Workspace)/test-files
               mv $(Pipeline.Workspace)/test-files/dist/test/* ${{ parameters.testWorkspace }}/node_modules/${{ parameters.testPackage }}/dist/test
               mv $(Pipeline.Workspace)/test-files/src/test/* ${{ parameters.testWorkspace }}/node_modules/${{ parameters.testPackage }}/src/test