[prefer-to-contain] handle bracket accessor properties

[G-Rath]

Once #363 is merged, prefer-to-contain should be adjusted to support bracket accessor properties:

expect(files['length']).toBe(1);
expect(/* args */)['not'].toBe(/* args */);
describe['skip'](/* args */);

[github-actions]

🎉 This issue has been resolved in version 25.3.3 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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