Fix e2e failures on 'Front Page' template. (#28638)

Attempting to fix e2e failures on a "Front Page" template selector. It looks like tt1-blocks no longer supplies a front-page template, and using Index should work as the tests were not reliant on the specific template.

packages/e2e-tests/specs/experiments/multi-entity-editing.test.js

@@ -144,18 +144,18 @@ describe( 'Multi-entity editor states', () => {
 		// Wait for blocks to load.
 		await canvas().waitForSelector( '.wp-block' );
 		expect( await isEntityDirty( 'header' ) ).toBe( false );
-		expect( await isEntityDirty( 'front-page' ) ).toBe( false );
+		expect( await isEntityDirty( 'Index' ) ).toBe( false );
 
 		// Switch back and make sure it is still clean.
-		await clickTemplateItem( 'Templates', 'Front Page' );
+		await clickTemplateItem( 'Templates', 'Index' );
 		await page.waitForFunction( () =>
 			Array.from( window.frames ).find(
 				( { name } ) => name === 'editor-canvas'
 			)
 		);
 		await canvas().waitForSelector( '.wp-block' );
 		expect( await isEntityDirty( 'header' ) ).toBe( false );
-		expect( await isEntityDirty( 'front-page' ) ).toBe( false );
+		expect( await isEntityDirty( 'Index' ) ).toBe( false );
 
 		removeErrorMocks();
 	} );

packages/e2e-tests/specs/experiments/multi-entity-saving.test.js

@@ -186,11 +186,11 @@ describe( 'Multi-entity save flow', () => {
 			// Navigate to site editor.
 			await siteEditor.visit();
 
-			// Ensure we are on 'front-page' demo template.
+			// Ensure we are on 'index' template.
 			await navigationPanel.open();
 			await navigationPanel.backToRoot();
 			await navigationPanel.navigate( 'Templates' );
-			await navigationPanel.clickItemByText( 'Front Page' );
+			await navigationPanel.clickItemByText( 'Index' );
 			await navigationPanel.close();
 
 			// Click the first block so that the template part inserts in the right place.

packages/e2e-tests/specs/experiments/template-part.test.js

@@ -53,11 +53,11 @@ describe( 'Template Part', () => {
 				'.edit-site-save-button__button:not(.is-busy)'
 			);
 
-			// Switch back to the front page template.
+			// Switch back to the Index template.
 			await navigationPanel.open();
 			await navigationPanel.backToRoot();
 			await navigationPanel.navigate( 'Templates' );
-			await navigationPanel.clickItemByText( 'Front Page' );
+			await navigationPanel.clickItemByText( 'Index' );
 			await navigationPanel.close();
 		}