Test groupBy property on githubIssues.queries setting

[alexr00]

Refs: #1881

• anyOS @mjbvz
• anyOS @ntrogh

Complexity: 2

Create Issue

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1. Install the pre-release version of GitHub Pull Requests and Issues.
2. Open a folder that contains a clone of a GitHub repo.
3. Open the "Issues" view so you can see the results of your testing.
4. Open settings and add githubIssues.queries. Use the default value to get started. Verify that the first query in the default value uses the new groupBy property.
5. Try modifying the queries in the setting. Try every combination of values for groupBy. Verify that you can figure out how to use the groupBy property. Verify that it does what you expect.