chore(e2e): Add tests for custom pages and items from UserProfile and UserButton

[panteliselef]

Description

We were missing tests for any kind of functionality for Custom pages and custom items. Given the fact that we may introduce new APIs for UB, having these tests will make sure that nothing breaks.

Test cases introduced: For UB and UP Custom pages

• Custom pages and link are set in the correct order
• Label, Icons, and content is correctly displayed
• Wrapping a page with context will work, and the custom page will get updated when state changes
• Absolute urls in Link will be respected
• Relative url in Link will be respected

For UB Custom items

• items are specified in the correct order
• Label, Icons, and content is correctly displayed
• Absolute urls in Link will be respected
• Relative url in Link will be respected
• Custom actions on Click work as expected

Checklist

• [ ] npm test runs as expected.
• [ ] npm run build runs as expected.
• [ ] (If applicable) JSDoc comments have been added or updated for any package exports
• [ ] (If applicable) Documentation has been updated

Type of change

• [ ] 🐛 Bug fix
• [ ] 🌟 New feature
• [ ] 🔨 Breaking change
• [ ] 📖 Refactoring / dependency upgrade / documentation
• [ ] other:

[changeset-bot[bot]]

🦋 Changeset detected

Latest commit: 07c8281884d0e0cc6072d2369ba404b33b8bb585

The changes in this PR will be included in the next version bump.

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