Fix packaging for Playwright.MSTest.v4 and Playwright.Xunit.v3 (#3226)

Author: Youssef1313

.azure-pipelines/publish.yml

@@ -77,7 +77,9 @@ extends:
               src/Playwright/Playwright.csproj;
               src/Playwright.NUnit/Playwright.NUnit.csproj;
               src/Playwright.MSTest/Playwright.MSTest.csproj;
+              src/Playwright.MSTest/Playwright.MSTest.v4.csproj;
               src/Playwright.Xunit/Playwright.Xunit.csproj;
+              src/Playwright.Xunit/Playwright.Xunit.v3.csproj;
               src/Playwright.TestAdapter/Playwright.TestAdapter.csproj;
             packDirectory: '$(Build.ArtifactStagingDirectory)/nuget'
             versioningScheme: 'off'