Install extensions with delay to workaround vscode bug (#8633)

Author: JoeRobich

test/vscodeLauncher.ts

@@ -69,15 +69,38 @@ export async function prepareVSCodeAndExecuteTests(
 
 async function installExtensions(extensionIds: string[], vscodeCli: string, vscodeArgs: string[]): Promise<void> {
     for (const extensionId of extensionIds) {
-        vscodeArgs.push('--install-extension', extensionId);
+        // Workaround for https://github.com/microsoft/vscode/issues/256031 to retry installing the extension with a delay.
+        let installError: any | undefined = undefined;
+        let installSucceeded = false;
+        for (let attempts = 0; attempts < 5; attempts++) {
+            try {
+                await installExtension(extensionId, vscodeCli, vscodeArgs);
+                installSucceeded = true;
+                break;
+            } catch (error) {
+                console.warn(`Failed to install extension ${extensionId}; retrying: ${error}`);
+                installError = error;
+                await new Promise((resolve) => setTimeout(resolve, 2000));
+            }
+        }
+
+        if (!installSucceeded) {
+            throw installError;
+        }
     }
 
+    console.log();
+}
+
+async function installExtension(extensionId: string, vscodeCli: string, vscodeArgs: string[]): Promise<void> {
+    const argsWithExtension = [...vscodeArgs, '--install-extension', extensionId];
+
     // Since we're using shell execute, spaces in the CLI path will get interpeted as args
     // Therefore we wrap the CLI path in quotes as on MacOS the path can contain spaces.
     const cliWrapped = `"${vscodeCli}"`;
-    console.log(`${cliWrapped} ${vscodeArgs}`);
+    console.log(`${cliWrapped} ${argsWithExtension}`);
 
-    const result = cp.spawnSync(cliWrapped, vscodeArgs, {
+    const result = cp.spawnSync(cliWrapped, argsWithExtension, {
         encoding: 'utf-8',
         stdio: 'inherit',
         // Workaround as described in https://github.com/nodejs/node/issues/52554
@@ -86,8 +109,6 @@ async function installExtensions(extensionIds: string[], vscodeCli: string, vsco
     if (result.error || result.status !== 0) {
         throw new Error(`Failed to install extensions: ${JSON.stringify(result)}`);
     }
-
-    console.log();
 }
 
 function getSln(workspacePath: string): string | undefined {