5633: Add fxa/sync integration tests r=csadilek a=isabelrios
Pull Request checklist
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- [x] **Quality**: This PR builds and passes detekt/ktlint checks (A pre-push hook is recommended)
- [x] **Tests**: This PR includes thorough tests or an explanation of why it does not
- [-] **Screenshots**: This PR includes screenshots or GIFs of the changes made or an explanation of why it does not
- [-] **Accessibility**: The code in this PR follows [accessibility best practices](https://github.com/mozilla-mobile/shared-docs/blob/master/android/accessibility_guide.md) or does not include any user facing features
This PR tries to add new tests, sync integration tests, to check the sync process Desktop<->Fenix, first for Bookmarks and in the future for more.
Co-authored-by: Isabel Rios <isabelrios@mackbookirios.home>
Co-authored-by: isabelrios <isabelrios@gmail.com>
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