Fix multiroot flaky CI tests (#11544)

* Fix flakiness

* The right fix

Author: Kartik Raj

src/test/initialize.ts

@@ -20,7 +20,7 @@ export const multirootPath = path.join(__dirname, '..', '..', 'src', 'testMultiR
 const workspace3Uri = vscode.Uri.file(path.join(multirootPath, 'workspace3'));
 
 //First thing to be executed.
-process.env['VSC_PYTHON_CI_TEST'] = '1';
+process.env.VSC_PYTHON_CI_TEST = '1';
 
 // Ability to use custom python environments for testing
 export async function initializePython() {

src/test/multiRootTest.ts

@@ -6,6 +6,7 @@ import { EXTENSION_ROOT_DIR_FOR_TESTS } from './constants';
 
 const workspacePath = path.join(__dirname, '..', '..', 'src', 'testMultiRootWkspc', 'multi.code-workspace');
 process.env.IS_CI_SERVER_TEST_DEBUGGER = '';
+process.env.VSC_PYTHON_CI_TEST = '1';
 
 function start() {
     console.log('*'.repeat(100));