This PR fixes#6560.
The fix has a few elements:
1) Bumps the Engine requirement to the latest release, namely `2023.1.1`.
2) Changed the logic of checking whether a given version matches the requirement. Previously, we relied on `VersionReq` from `semver` crate which did not behave intuitively when the required version had a prerelease suffix. Now we rely directly on Semantic Versioning rules of precedence.
3) Code cleanups, including deduplicating 3 copies of the version-checking code, and moving some tests to more sensible places.
This is a re-creation of #6308.
Creates buttons to switch between cloud and local backends for listing directories, opening projects etc.
# Important Notes
The desktop backend currently uses a hardcoded list of templates, mostly because they look better because they have background images. However, it can easily be changed to use `listSamples` endpoint and switched to the default grey background.
This PR contains minimal integration with new engine's method and an integration test printing the method's return value. It was written as a part of https://www.pivotaltracker.com/story/show/181743571
# Important Notes
The test requires 2022.1.1-nightly.2022-04-26 engine version or later.
