Update observables + AD tests with MTK v10

[DhairyaLGandhi]

Checklist

• Appropriate tests were added
• Any code changes were done in a way that does not break public API
• All documentation related to code changes were updated
• The new code follows the
  contributor guidelines, in particular the SciML Style Guide and
  COLPRAC.
• Any new documentation only uses public API

Additional context

There seem to be some variable map changes in latest MTK, so updating tests to reflect that.

Add any other context about the problem here.

[ChrisRackauckas]

If you change the vector ordering you need to change back the answer ordering though 😅

[DhairyaLGandhi]

We take the output of canonicalize(Tunable(), ...) and the solve calls through the usual probmap and probpmap, which will order accordingly, and we AD through.

[ChrisRackauckas]

    du_ = [1.0, 1.0, 1.0, 0.0]
    du = [du_ for _ in sol[[D(x), x, y, z]]]

the order of this is not based on the tunable order, it's based on the sort order of u. That's why it broke. I am saying if you fix the order by checking it symbolically, then you should change the du_ being tested to the order of the symbolic index.