fix: add JDK 25 setup for java25 e2e test plans

The java-gradle-java25 and java-maven-java25 test plans require JDK 25
at 'C:\Program Files\Java\jdk-25', but the pipeline only installed JDK 21.
This caused the Language Server to fail to start, timing out on the
ls-ready step.

- Install JDK 25 via setup-java before JDK 21
- Create a directory junction at the expected path
- JDK 21 remains the default JAVA_HOME

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: wenytang-ms

.github/workflows/e2e-autotest.yml

@@ -37,7 +37,18 @@ jobs:
         with:
           node-version: 20
 
-      - name: Setup Java
+      - name: Setup Java 25 (for java25 test plans)
+        uses: actions/setup-java@v4
+        with:
+          distribution: temurin
+          java-version: 25
+
+      - name: Create JDK 25 path for test plans
+        shell: pwsh
+        run: |
+          New-Item -ItemType Junction -Path "C:\Program Files\Java\jdk-25" -Target $env:JAVA_HOME
+
+      - name: Setup Java 21
         uses: actions/setup-java@v4
         with:
           distribution: temurin