Test unassign timeline event

[alexr00]

Refs: #6897

• anyOS @rzhao271
• anyOS @Tyriar

Complexity: 2

Create Issue

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Setup

• Install the pre-release version of GitHub Pull Requests
• Open a clone of a GitHub repo where you don't mind assigning and unassigning an issue or PR many times.

Testing

The "unassigned" event will now show in the issue/PR timeline. If there are several assign and unassign events back to back within a short (10 minutes) time, then these will be consolidated.

• Open an issue or PR from the Issues view or Pull Requests view.
• Assign the issue/PR and verify that the assign event shows.
• Unassign the issue/PR and verify that the unassign even shows and is consolidated with the assign even.
• Wait 10+ minutes before making an assignment or unassignment, then make another assignment. Verify that the new timeline item shows un-consolidated.
• Try with various combinations of assignees, unassignees, and times, and verify it does what you'd expect.