chore: Fix DataStore Tests

[tylerjroach]

• PR title and description conform to Pull Request guidelines.

Issue #, if available:

Description of changes:

We had a few inconsistent tests that were only waiting on 1 hub event, because it was not known if 2 rapid mutations to an item would end up batched when syncing, or come 1 at a time. Rather than just waiting on 1 hub event now, some of the checks have been updated to look for the last expected item in a returned hub event.

The AndroidX Orchestrator has also been added to compartmentalize tests. running on a local machine. DeviceFarm still uses its own per class orchestrator, but this change allows all tests to pass locally while running as a full suite.

How did you test these changes?
(Please add a line here how the changes were tested)

Documentation update required?

• No
• Yes (Please include a PR link for the documentation update)

General Checklist

• Added Unit Tests
• Added Integration Tests
• Security oriented best practices and standards are followed (e.g. using input sanitization, principle of least privilege, etc)

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (e102c2b) 41.80% compared to head (682f706) 41.79%.

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Additional details and impacted files

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- Coverage   41.80%   41.79%   -0.02%     
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  Files         903      903              
  Lines       28887    28887              
  Branches     4113     4113              
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- Hits        12076    12072       -4     
- Misses      15487    15489       +2     
- Partials     1324     1326       +2