Support dynamic jenkins workflow for PE

Now that the differences in workflow between PE and foss have largely been eliminated, there is nothing in the existing jenkins dynamic setup that is different, under the hood, between foss and PE workflows. This means adding the dynamic job creation workflow for PE can just be an alias, which this PR creates, as pe:jenkins:uber_build. This existing static uber_build task is removed, now that it is superseded by the dynamic one.

This PR also resolves a bug introduced when we replaced colon characters with underscores in the configuration axis names of the packaging job. The repo creation job still expected a path to an artifact that was colon separated, meaning it always failed. Here we add a commit that updates the path.