Smoke tests: fixes for notebook vars tests (#5196)

Fix issues with notebook vars test. Assuming that we are changing
interpreters too quickly

### QA Notes

All smoke tests pass

test/smoke/src/areas/positron/variables/variables-notebook.test.ts

@@ -9,8 +9,7 @@ import { setupAndStartApp } from '../../../test-runner/test-hooks';
 
 describe('Variables Pane - Notebook', () => {
 
-	// This test fails on WEB: https://github.com/posit-dev/positron/issues/2452
-	describe('Python Notebook Variables Pane #pr', () => {
+	describe('Python Notebook Variables Pane #pr #web', () => {
 		setupAndStartApp();
 
 		before(async function () {
@@ -19,16 +18,27 @@ describe('Variables Pane - Notebook', () => {
 
 		it('Verifies Variables pane basic function for notebook with python interpreter [C669188]', async function () {
 			const app = this.app as Application;
-			await PositronPythonFixtures.SetupFixtures(this.app as Application);
 
 			await app.workbench.positronNotebooks.createNewNotebook();
+
+			// workaround issue where starting multiple interpreters in quick succession can cause startup failure
+			await app.code.wait(1000);
+
 			await app.workbench.positronNotebooks.selectInterpreter('Python Environments', process.env.POSITRON_PY_VER_SEL!);
 			await app.workbench.positronNotebooks.addCodeToFirstCell('y = [2, 3, 4, 5]');
 			await app.workbench.positronNotebooks.executeCodeInCell();
 
+			const filename = 'Untitled-1.ipynb';
+
+			// temporary workaround for fact that variables group
+			// not properly autoselected on web
+			if (app.web) {
+				await app.workbench.positronVariables.selectVariablesGroup(filename);
+			}
+
 			const interpreter = app.workbench.positronVariables.interpreterLocator;
 			await expect(interpreter).toBeVisible();
-			await expect(interpreter).toHaveText('Untitled-1.ipynb');
+			await expect(interpreter).toHaveText(filename);
 
 			await app.workbench.positronLayouts.enterLayout('fullSizedAuxBar');
 			const variablesMap = await app.workbench.positronVariables.getFlatVariables();
@@ -45,9 +55,12 @@ describe('Variables Pane - Notebook', () => {
 
 		it('Verifies Variables pane basic function for notebook with R interpreter [C669189]', async function () {
 			const app = this.app as Application;
-			await PositronRFixtures.SetupFixtures(this.app as Application);
 
 			await app.workbench.positronNotebooks.createNewNotebook();
+
+			// workaround issue where starting multiple interpreters in quick succession can cause startup failure
+			await app.code.wait(1000);
+
 			await app.workbench.positronNotebooks.selectInterpreter('R Environments', process.env.POSITRON_R_VER_SEL!);
 			await app.workbench.positronNotebooks.addCodeToFirstCell('y <- c(2, 3, 4, 5)');
 			await app.workbench.positronNotebooks.executeCodeInCell();