Make CI more friendly to run locally

[MabezDev]

This will end up with us moving logic from YAMLs, to within the xtask itself.

One idea from out meeting is to bundle all the individual xtask invocations into one command where we can just call cargo xtask ci --chip espblah.

We will also want to clean up and enforce full MSRV checks which are currently only partially checked by yaml.