Backport of ci: fix test splits that have less test packages than runner count from hanging into release/1.14.x #17084
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Backport
This PR is auto-generated from #17080 to be assessed for backporting due to the inclusion of the label backport/1.14.
WARNING automatic cherry-pick of commits failed. Commits will require human attention.
The below text is copied from the body of the original PR.
Description
In 1.13, there are only two compatibility test packages. So when a generate matrix job has a TOTAL_RUNNERS of 5 but there are only 2 packages, the process hangs. This PR changes the runner count to 2 in this case.
Another issue that occurs that is fixed in this PR is that when you specify TOTAL_RUNNERS = 4, you will actually split across 5 runners. (The same occurs with any number you set TOTAL_RUNNERS to. You will actually get 1 greater.)
Overview of commits