Add source/install telemetry and drop unreliable activation check

Follow-up to v0.27.5 telemetry analysis
(devdiv-azure-service-dmitryr/azure-java-migration-copilot-vscode-extension#5979):

- Add a source field (SOURCE_CVE / SOURCE_JAVA_UPGRADE) to the
  upgradeNotification.show event so NOTIFY-level data can be split by
  CVE vs upgrade and aligned with downstream funnel stages.
- Emit an installSucceeded event right after installExtension resolves.
- Drop the post-install getExtensionState re-check that produced false
  activation-timeout results; the not-installed path now reports
  proceeded and returns true after install completes.

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

Author: FrankLiu4138

src/upgrade/display/notificationManager.ts

@@ -93,6 +93,7 @@ class NotificationManager implements IUpgradeIssuesRenderer {
                 sendInfo(operationId, {
                     operationName: "java.dependency.upgradeNotification.show",
                     extensionState,
+                    source: hasCVEIssue ? Upgrade.SOURCE_CVE : Upgrade.SOURCE_JAVA_UPGRADE,
                 });
 
                 const buttons = hasCVEIssue

src/upgrade/utility.ts

@@ -197,6 +197,9 @@ export async function checkOrInstallAppModExtensionForUpgrade(
         }
 
         await commands.executeCommand("workbench.extensions.installExtension", ExtensionName.APP_MODERNIZATION_FOR_JAVA);
+        sendInfo(operationId, {
+            operationName: "java.dependency.upgradeFlow.installSucceeded",
+        });
 
         if (state === "outdated") {
             // Extension was updated (not freshly installed) — reload required
@@ -221,16 +224,13 @@ export async function checkOrInstallAppModExtensionForUpgrade(
 
         await checkOrPromptToEnableAppModExtension("upgrade");
 
-        // Wait briefly for the newly installed extension to activate
+        // Give the newly installed extension a moment to activate before proceeding
         await new Promise(resolve => setTimeout(resolve, 2000));
 
-        // Re-check if the newly installed extension is active and meets version requirement
-        const newState = getExtensionState(extensionIdToCheck);
-        const canProceed = newState === "up-to-date";
         sendInfo(operationId, {
             operationName: "java.dependency.upgradeFlow.result",
-            upgradeFlowResult: canProceed ? "proceeded" : "activation-timeout",
+            upgradeFlowResult: "proceeded",
         });
-        return canProceed;
+        return true;
     })();
-}
+}