fix: checkout test repos as siblings for correct relative paths (#1608)

Test plans use '../../vscode-java' and '../../eclipse.jdt.ls' relative to
the plan file location, expecting these repos to be siblings of the main
repo (matching local dev layout). The previous CI config checked them out
inside the repo root, causing all 15 e2e tests to fail with ENOENT.

Change checkout path from 'vscode-java' to '../vscode-java' (and same for
eclipse.jdt.ls) so the CI directory structure matches the expected layout.

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

Author: wenytang-ms

.github/workflows/e2e-autotest.yml

@@ -51,13 +51,13 @@ jobs:
         uses: actions/checkout@v4
         with:
           repository: redhat-developer/vscode-java
-          path: vscode-java
+          path: ../vscode-java
 
       - name: Checkout eclipse.jdt.ls (Gradle test projects)
         uses: actions/checkout@v4
         with:
           repository: eclipse-jdtls/eclipse.jdt.ls
-          path: eclipse.jdt.ls
+          path: ../eclipse.jdt.ls
 
       - name: Setup Node.js
         uses: actions/setup-node@v4
@@ -137,13 +137,13 @@ jobs:
         uses: actions/checkout@v4
         with:
           repository: redhat-developer/vscode-java
-          path: vscode-java
+          path: ../vscode-java
 
       - name: Checkout eclipse.jdt.ls
         uses: actions/checkout@v4
         with:
           repository: eclipse-jdtls/eclipse.jdt.ls
-          path: eclipse.jdt.ls
+          path: ../eclipse.jdt.ls
 
       - name: Setup Node.js
         uses: actions/setup-node@v4