ci: re-enable tests using the beta channel

[amondnet]

Describe the changes proposed in this Pull Request.

If the PR fixes a specific issue, reference the issue with Fixes #.

I removed tests using the beta channel in https://github.com/mobxjs/mobx.dart/pull/907. This PR reverts it.

---

Pull Request Checklist

• [ ] If the changes are being made to code, ensure the version in pubspec.yaml is updated.
• [ ] Increment the major/minor/patch/patch-count, depending on the complexity of change
• [ ] Add the necessary unit tests to ensure the coverage does not drop
• [ ] Update the Changelog to include all changes made in this PR, organized by version
• [ ] Run the melos run set_version command from the root directory
• [ ] Include the necessary reviewers for the PR
• [ ] Update the docs if there are any API changes or additions to functionality

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[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (41f55df) 99.01% compared to head (0b8418d) 99.01%. Report is 1 commits behind head on main.

:exclamation: Current head 0b8418d differs from pull request most recent head b28aeaa. Consider uploading reports for the commit b28aeaa to get more accurate results

Additional details and impacted files

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