Playwright Utils: Fix 'clickBlockOptionsMenuItem' helper

[Mamaduka]

What?

PR fixes a bug where the editor.clickBlockOptionsMenuItem helper failed for menu items displaying keyboard shortcodes.

Why?

The helper should work with any menu item in the Options dropdown.

How?

Switch to page.getByRole(), which uses case-insensitive and substring matching for labels by default.

Testing Instructions

The following e2e test case will fail on the trunk:

/**
 * WordPress dependencies
 */
const { test, expect } = require( '@wordpress/e2e-test-utils-playwright' );

test.describe( 'clickBlockOptionsMenuItem', () => {
	test.beforeEach( async ( { admin } ) => {
		await admin.createNewPost();
	} );

	test( 'should delete a block via options menu', async ( {
		editor,
		page,
	} ) => {
		await editor.canvas
			.getByRole( 'button', { name: 'Add default block' } )
			.click();
		await page.keyboard.type( 'Hey!' );

		await editor.clickBlockOptionsMenuItem( 'Delete' );
		await expect(
			editor.canvas.getByRole( 'document', { name: 'Block: Paragraph' } )
		).toBeHidden();
	} );
} );

[github-actions]

Flaky tests detected in 3619b24.
Some tests passed with failed attempts. The failures may not be related to this commit but are still reported for visibility. See the documentation for more information.

🔍 Workflow run URL: https://github.com/WordPress/gutenberg/actions/runs/6783799696
📝 Reported issues:

• [Flaky Test] should partially select with shift + click (@webkit) #53524 in /test/e2e/specs/editor/various/multi-block-selection.spec.js
• [Flaky Test] should select with shift + click #48390 in /test/e2e/specs/editor/various/multi-block-selection.spec.js

[Mamaduka]

Thanks for the review, @swissspidy 🙇