e2e test: Duplicate variables entries (#6022)

### Intent 

To help test #5887 these new tests ensure that after an interpreter env is restarted, it doens't create a duplicate entry in variables pane.

### Approach

* Restarts interpreter and checks that only 1 still exists
* R & Python.. I thought adding a notebook version would be unnecessary, but can if needed.

### QA Notes

Tests are skipped now due to the issue. But you can check the tests by removing the skip and it will fail with

```
    Error: expect(received).toBe(expected) // Object.is equality

    Expected: 1
    Received: 2

```
All other variable tests should still pass 
@:variables

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test/e2e/pages/variables.ts

@@ -150,6 +150,13 @@ export class Variables {
 		await this.code.driver.page.locator('a.action-menu-item', { hasText: name }).first().click();
 	}
 
+	async getVariablesGroupList() {
+		await this.code.driver.page.locator(VARIABLES_GROUP_SELECTOR).click();
+		const groupList = await this.code.driver.page.locator('a.action-menu-item').all();
+		const groupNames = await Promise.all(groupList.map(async (group) => group.innerText()));
+		return groupNames;
+	}
+
 	async clickDatabaseIconForVariableRow(rowName: string) {
 		const DATABASE_ICON = '.codicon-database';
 		await this.code.driver.page.locator(VARIABLE_ITEMS).filter({ hasText: rowName }).locator(DATABASE_ICON).click();

test/e2e/tests/variables/variables-pane.test.ts

@@ -36,6 +36,17 @@ test.describe('Variables Pane', {
 
 	});
 
+	test.skip('Python - Verifies only 1 entery per environment', {
+		annotation: [{ type: 'issue', description: 'https://github.com/posit-dev/positron/issues/5887' }],
+	}, async function ({ app, logger, python }) {
+		await app.workbench.console.barClearButton.click();
+		await app.workbench.console.barRestartButton.click();
+		await app.workbench.console.waitForReady('>>>');
+		await app.workbench.console.waitForConsoleContents('restarted');
+		const groupList = app.workbench.variables.getVariablesGroupList();
+		expect((await groupList).length).toBe(1);
+	});
+
 	test('R - Verifies Variables pane basic function [C628635]', async function ({ app, logger, r }) {
 		const executeCode = async (code: string) => {
 			await app.workbench.console.executeCode('R', code, '>');
@@ -54,4 +65,18 @@ test.describe('Variables Pane', {
 		expect(variablesMap.get('y')).toStrictEqual({ value: '10', type: 'dbl' });
 		expect(variablesMap.get('z')).toStrictEqual({ value: '100', type: 'dbl' });
 	});
+
+
+	test.skip('R - Verifies only 1 entery per environment', {
+		annotation: [{ type: 'issue', description: 'https://github.com/posit-dev/positron/issues/5887' }],
+	}, async function ({ app, logger, r }) {
+		await app.workbench.console.barClearButton.click();
+		await app.workbench.console.barRestartButton.click();
+		await app.workbench.console.waitForReady('>');
+		await app.workbench.console.waitForConsoleContents('restarted');
+		const groupList = app.workbench.variables.getVariablesGroupList();
+		expect((await groupList).length).toBe(1);
+	});
 });
+
+