fix(e2e): collapse JAVA PROJECTS tree before second click-project-node (#1009)

The Test 1 `enter-class-name App2` step opens App2.java in the editor.
With link-with-editor on (default), this auto-expands the JAVA PROJECTS
tree to my-app → src/main/java → com.mycompany.app → App2.java to
reveal the newly created file.

When Test 2 then closes editors and tries to click the my-app root node
again, the tree is still expanded so my-app is no longer at row 0. Even
after `focus-java-projects`, the row gets scrolled, and the sticky JAVA
PROJECTS pane-header (.pane-header .title) intercepts the click. CI logs
show the click hit the codicon-collapse-all button on the view title bar
instead of the my-app row, causing `click-project-node-2` to fail.

`collapseWorkspaceRoot` only collapses the Explorer view's workspace
root, not the JAVA PROJECTS view. Use the view's own `Collapse All`
title-bar action via clickViewTitleAction (autotest 0.6.6+) to reset
the tree state, putting my-app back at row 0 below the pane-header.

Verified locally: 40/40 steps pass with the new collapse step.

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

Author: wenytang-ms

test/e2e-plans/java-dep-file-operations.yaml

@@ -99,6 +99,13 @@ steps:
     action: "run command Java Projects: Focus on Java Projects View"
     waitBefore: 1
 
+  # Test 1 expanded my-app → src/main/java → com.mycompany.app to reveal the
+  # newly-created App2.java. Reset the JAVA PROJECTS tree so my-app is back
+  # at row 0 and not occluded by the sticky pane-header on the next click.
+  - id: "collapse-java-projects-tree-2"
+    action: 'clickViewTitleAction "Java Projects" "Collapse All"'
+    waitBefore: 1
+
   - id: "click-project-node-2"
     action: "click my-app tree item"
     waitBefore: 1