[Feature Request] Add the ability to change the priority of a pipeline run ("run next")

**Is your feature request related to a problem? Please describe.**

Managing the priority of pipelines runs pressing "run next" for each and every run is cumbersome.

As Azure DevOps is not supporting priortizing builds on a build config level (see https://developercommunity.visualstudio.com/t/ability-to-set-build-priority/365507), a workaround could be to manage the priority of pipeline runs after they were queued using this CLI.

**Describe the solution you'd like**

`az pipelines run-next {run-id}`

Best would be to just modify a build config. But if this is not possible, we should expose the "run next" feature through this CLI