Remove interpreter selector from Packages pane and update tests

- Delete unused PackagesInstanceMenuButton component
- Update e2e test to not check for version button (no longer exists)
- Minor style: use Boolean() instead of !! for context key

See #12922

Author: bricestacey

src/vs/workbench/contrib/positronPackages/browser/components/packagesInstanceMenuButton.tsx

@@ -106,7 +106,7 @@ export class PositronPackagesService extends Disposable implements IPositronPack
 		this._activeInstance = instance;
 
 		// Update context keys
-		this._hasActiveSessionContextKey.set(!!instance);
+		this._hasActiveSessionContextKey.set(Boolean(instance));
 
 		// Clear previous instance's busy state tracking
 		this._activeInstanceDisposables.clear();

src/vs/workbench/contrib/positronPackages/browser/positronPackagesService.ts

@@ -25,19 +25,14 @@ test.describe('Environment Pane', {
 		await getPackagesButton(page).click();
 	});
 
-	async function verifyPackagesList(page: any, expectedVersion: string) {
+	async function verifyPackagesList(page: any) {
 		// Click on the Packages button in the environment pane
 		await getPackagesButton(page).click();
 
 		// Verify the packages list is displayed
 		const packagesContainer = page.locator('.positron-packages-list');
 		await expect(packagesContainer).toBeVisible();
 
-		// Verify button contains the expected version
-		const versionButton = packagesContainer.locator('.action-bar-region-left button').first();
-		await expect(versionButton).toBeVisible();
-		await expect(versionButton).toContainText(expectedVersion);
-
 		// Verify package list items are present
 		const packageItems = packagesContainer.locator('.packages-list-item-name');
 		await expect(packageItems.first()).toBeVisible();
@@ -46,10 +41,10 @@ test.describe('Environment Pane', {
 	}
 
 	test('Python - Click packages button', async function ({ page, python: _python }) {
-		await verifyPackagesList(page, process.env.POSITRON_PY_VER_SEL!);
+		await verifyPackagesList(page);
 	});
 
 	test('R - Click packages button', async function ({ page, r: _r }) {
-		await verifyPackagesList(page, process.env.POSITRON_R_VER_SEL!);
+		await verifyPackagesList(page);
 	});
 });