GHA: Enable testing

Instead of only building the tests, execute them as well

Fixes: #9427
Issue: rdar://165491718

Author: bkhouri

.github/workflows/pull_request.yml

@@ -12,11 +12,12 @@ concurrency:
   cancel-in-progress: true
 
 jobs:
-  tests-using-native:
+  tests:
     needs: [soundness]
     strategy:
       fail-fast: false
       matrix:
+        executableTargetBuildSystem: ["native", "swiftbuild"]
         buildSystem: ["native", "swiftbuild"]
         linuxSwiftVersion: ['["nightly-main", "nightly-6.2"]', '["nightly-main"]']
         enable_windows_checks: [true]
@@ -27,24 +28,24 @@ jobs:
             enable_windows_checks: true
           - buildSystem: "native"
             linuxSwiftVersion: '["nightly-main"]'
-    name: Test (${{ matrix.buildSystem }})
+    name: Test (${{ matrix.buildSystem }}) (exectable target build system ${{ matrix.executableTargetBuildSystem }})
     uses: swiftlang/github-workflows/.github/workflows/swift_package_test.yml@0.0.1
     with:
       linux_os_versions: '["amazonlinux2", "bookworm", "noble", "jammy", "rhel-ubi9"]'
       linux_swift_versions: ${{ matrix.linuxSwiftVersion }}
       linux_pre_build_command: ./.github/scripts/prebuild.sh
-      linux_build_command: 'swift run swift-build --build-tests --build-system ${{ matrix.buildSystem}}'
+      linux_build_command: 'swift run --build-system ${{ matrix.executableTargetBuildSystem }} swift-test --parallel --build-system ${{ matrix.buildSystem}}'
       windows_swift_versions: '["nightly-main"]'
       windows_pre_build_command: 'Invoke-Program .\.github\scripts\prebuild.ps1'
-      windows_build_command: 'Invoke-Program swift run swift-build --build-tests --build-system ${{ matrix.buildSystem}}'
+      windows_build_command: 'Invoke-Program swift run --build-system ${{ matrix.executableTargetBuildSystem }} -Xlinker /ignore:4217 swift-test -Xlinker /ignore:4217 --parallel --build-system ${{ matrix.buildSystem}}'
       enable_windows_checks: ${{ matrix.enable_windows_checks }}
       enable_ios_checks: true
       enable_macos_checks: true
       macos_exclude_xcode_versions: "[{\"xcode_version\": \"16.3\"}, {\"xcode_version\": \"16.4\"}]"
-      macos_build_command: 'swift run swift-build --build-tests --build-system ${{ matrix.buildSystem}}'
+      macos_build_command: 'swift run --build-system ${{ matrix.executableTargetBuildSystem }} swift-test --parallel --build-system ${{ matrix.buildSystem}}'
 
-  tests-using-swiftbuild:
-    name: Test (all SwiftBuild)
+  build-using-swiftbuild:
+    name: Build (all SwiftBuild)
     needs: [soundness]
     uses: swiftlang/github-workflows/.github/workflows/swift_package_test.yml@0.0.1
     with: