Multi-selecting tests does not work for `Run multiple times...` and `Run until failure...`

[matthewbastien]

Describe the bug
The VS Code testing view allows you to select multiple tests to run. However, the Run multiple times... or Run until failure... options do nothing when multiple tests are selected.

To Reproduce

1. Select multiple tests in the testing view.
2. Right click and select Run multiple times... or Run until failure...

You will observe that the tests are not run and the first selected test will show up as skipped in the testing view.

Expected behavior
Run multiple times... and Run until failure... should both work when selecting a single test or multiple.

[plemarquand]

Verified with 9f874ec