Add extrincic ordering check to CI

[chevdor]

This PR adds running a manual check for the extrinsic ordering.
A test run can be seen here: https://github.com/chevdor/cumulus/actions/runs/1287438927

What currently fails for some reason atm is not critical, the CI seems to fail killing the polkadot-collator (it works fine with polkadot).

[apopiak]

this is hard-coded to v3, we might want to default to latest?

[chevdor]

This is just an example to show the pattern. In general, users will NOT use latest, they will want to point at a specific version so having the version show up makes it easier. Once we have v4 released, it will be obviouls how to change the default string. If I replace with latest, the user will not (easily) know whether to use 3 or v3 for instance.

[TriplEight]

Looks good, but in general, it's not great to separate the pipelines making them run independently

[chevdor]

it's not great to separate the pipelines making them run independently

I agree. For now, many of the steps are manual. The reaons is that instead of going right away for a big CI pipeline that will sill surely fail in many places, it is much simpler to start formalizing with independant pipelines that can be started manually, troubleshooted and re-started indepdently. Once everything works 100%, we can collapse all of those into one single pipeline if that still makes sense.