refactor(telemetry): replace extensionOutdated with extensionInstall start/end

Remove separate extensionOutdated event. Now extensionInstall has
start (with action: install/update) and end (with action + result).

Co-Authored-By: Claude Opus 4 <noreply@anthropic.com>

Author: FrankLiu4138

src/upgrade/utility.ts

@@ -175,25 +175,23 @@ export async function checkOrInstallAppModExtensionForUpgrade(
         if (installedVersion && semver.gte(installedVersion, Upgrade.MIN_APPMOD_VERSION)) {
             return;
         }
-        // Extension is installed but too old — update it
-        sendInfo("", {
-            operationName: "java.dependency.upgrade.extensionOutdated",
-            installedVersion,
-            minRequiredVersion: Upgrade.MIN_APPMOD_VERSION,
-        });
     }
 
     const action = ext ? "update" : "install";
+    sendInfo("", {
+        operationName: "java.dependency.upgrade.extensionInstall.start",
+        action,
+    });
     try {
         await commands.executeCommand("workbench.extensions.installExtension", ExtensionName.APP_MODERNIZATION_FOR_JAVA);
         sendInfo("", {
-            operationName: "java.dependency.upgrade.extensionInstall",
+            operationName: "java.dependency.upgrade.extensionInstall.end",
             action,
             result: "success",
         });
     } catch (e) {
         sendInfo("", {
-            operationName: "java.dependency.upgrade.extensionInstall",
+            operationName: "java.dependency.upgrade.extensionInstall.end",
             action,
             result: "failure",
             error: e instanceof Error ? e.message : String(e),