Delete AD versions of GradP, DivU and Stabilization discretization

[Ivar Stefansson]

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[Ivar Stefansson]

Use BiotAd instead in the few places where the classes are used.

[Eirik Keilegavlen]

Agree.

[Ivar Stefansson]

Turns out this is nontrivial because parsing of discretization matrices stored under different keywords (flow/mechanics). Closing unresolved.