Enable Junit reports for Scalatest (#3756)

Changelog
- enable graphical test results for Scalatest tests like we have for [stdlib tests](https://github.com/enso-org/enso/actions/runs/3180677675/jobs/5184855484)

# Important Notes
Sometimes the report is created on a different workflow, like [here](https://github.com/enso-org/enso/actions/runs/3196147595/jobs/5217691808). Turned out it is a [known](dorny/test-reporter#67) issue in GitHub Actions https://github.com/orgs/community/discussions/24616

.github/workflows/scala-new.yml

@@ -80,7 +80,15 @@ jobs:
         if: success() || failure()
         with:
           name: Enso Standard Library Tests (linux)
-          path: ${{ env.ENSO_TEST_JUNIT_DIR }}/**/*.xml
+          path: ${{ env.ENSO_TEST_JUNIT_DIR }}/*/*.xml
+          path-replace-backslashes: "true"
+          reporter: java-junit
+      - name: Engine test report
+        uses: dorny/test-reporter@v1
+        if: success() || failure()
+        with:
+          name: Engine Tests (linux)
+          path: ${{ env.ENSO_TEST_JUNIT_DIR }}/*.xml
           path-replace-backslashes: "true"
           reporter: java-junit
   enso-build-cli-ci-gen-job-ci-check-backend-macos:
@@ -146,7 +154,15 @@ jobs:
         if: success() || failure()
         with:
           name: Enso Standard Library Tests (macos)
-          path: ${{ env.ENSO_TEST_JUNIT_DIR }}/**/*.xml
+          path: ${{ env.ENSO_TEST_JUNIT_DIR }}/*/*.xml
+          path-replace-backslashes: "true"
+          reporter: java-junit
+      - name: Engine test report
+        uses: dorny/test-reporter@v1
+        if: success() || failure()
+        with:
+          name: Engine Tests (macos)
+          path: ${{ env.ENSO_TEST_JUNIT_DIR }}/*.xml
           path-replace-backslashes: "true"
           reporter: java-junit
   enso-build-cli-ci-gen-job-ci-check-backend-windows:
@@ -214,7 +230,15 @@ jobs:
         if: success() || failure()
         with:
           name: Enso Standard Library Tests (windows)
-          path: ${{ env.ENSO_TEST_JUNIT_DIR }}/**/*.xml
+          path: ${{ env.ENSO_TEST_JUNIT_DIR }}/*/*.xml
+          path-replace-backslashes: "true"
+          reporter: java-junit
+      - name: Engine test report
+        uses: dorny/test-reporter@v1
+        if: success() || failure()
+        with:
+          name: Engine Tests (windows)
+          path: ${{ env.ENSO_TEST_JUNIT_DIR }}/*.xml
           path-replace-backslashes: "true"
           reporter: java-junit
 env:

build.sbt

@@ -210,9 +210,13 @@ ThisBuild / scalacOptions ++= Seq(
   "-Ywarn-unused:privates"              // Warn if a private member is unused.
 )
 
-ThisBuild / Test / testOptions += Tests.Argument(
-  "-oI"
-)
+ThisBuild / Test / testOptions ++=
+  Seq(Tests.Argument("-oI")) ++
+  sys.env
+    .get("ENSO_TEST_JUNIT_DIR")
+    .map { junitDir =>
+      Tests.Argument(TestFrameworks.ScalaTest, "-u", junitDir)
+    }
 
 val jsSettings = Seq(
   scalaJSLinkerConfig ~= { _.withModuleKind(ModuleKind.ESModule) }