test: fix close-all-editors palette label

The previous label 'Workbench: Close All Editors' does not exist in
VS Code's command palette - the actual visible label is
'View: Close All Editors'. The palette fuzzy match silently produced
no result, so Enter dismissed the palette and the test step 'passed'
in ~830ms without actually closing the webview. Subsequent
verifyWebview assertions still passed because getWebviewText
concatenates innerText from all iframe.webview frames, so prior
webview content leaked into later checks.

Use the exact palette label so the editor area is genuinely cleared
between webviews, confirmed by inspecting *_after.png screenshots.

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

Author: wenytang-ms

test-plans/java-webview-migration.yaml

@@ -84,7 +84,7 @@ steps:
     timeout: 30
 
   - id: "close-help-center"
-    action: "run command Workbench: Close All Editors"
+    action: "run command View: Close All Editors"
 
   # ══════════════════════════════════════════════════════════════════════
   # 2. Tips for Beginners (java.gettingStarted)
@@ -109,7 +109,7 @@ steps:
     timeout: 30
 
   - id: "close-beginner-tips"
-    action: "run command Workbench: Close All Editors"
+    action: "run command View: Close All Editors"
 
   # ══════════════════════════════════════════════════════════════════════
   # 3. Install New JDK (java.installJdk)
@@ -133,7 +133,7 @@ steps:
     timeout: 30
 
   - id: "close-install-jdk"
-    action: "run command Workbench: Close All Editors"
+    action: "run command View: Close All Editors"
 
   # ══════════════════════════════════════════════════════════════════════
   # 4. Configure Java Runtime (java.runtime)
@@ -159,7 +159,7 @@ steps:
     timeout: 30
 
   - id: "close-java-runtime"
-    action: "run command Workbench: Close All Editors"
+    action: "run command View: Close All Editors"
 
   # ══════════════════════════════════════════════════════════════════════
   # 5. Project Settings (java.projectSettings)
@@ -186,7 +186,7 @@ steps:
     timeout: 30
 
   - id: "close-project-settings"
-    action: "run command Workbench: Close All Editors"
+    action: "run command View: Close All Editors"
 
   # ══════════════════════════════════════════════════════════════════════
   # 6. Configure Classpath (java.classpathConfiguration)
@@ -210,7 +210,7 @@ steps:
     timeout: 30
 
   - id: "close-classpath-config"
-    action: "run command Workbench: Close All Editors"
+    action: "run command View: Close All Editors"
 
   # ══════════════════════════════════════════════════════════════════════
   # 7. Formatter Settings (java.formatterSettings)
@@ -238,7 +238,7 @@ steps:
       contains: "CodeFormatterProfile"
 
   - id: "close-profile-file-before-formatter"
-    action: "run command Workbench: Close All Editors"
+    action: "run command View: Close All Editors"
 
   - id: "open-formatter-settings"
     action: "run command Java: Open Java Formatter Settings with Preview"
@@ -260,7 +260,7 @@ steps:
     timeout: 45
 
   - id: "close-formatter-settings"
-    action: "run command Workbench: Close All Editors"
+    action: "run command View: Close All Editors"
 
   # ══════════════════════════════════════════════════════════════════════
   # 8. Overview (java.overview)
@@ -283,4 +283,4 @@ steps:
     timeout: 30
 
   - id: "close-overview"
-    action: "run command Workbench: Close All Editors"
+    action: "run command View: Close All Editors"