deprecate dropgrad and ignore

[mzgubic]

Contributes to #1235

I'll do nograd separately since it is used for a few adjoints that may need to be ported first.

[ToucheSir]

Perhaps we could add a note in the docs about these deprecations pointing to CRC, or keep the autodocs and add pointers in the docstrings?

[CarloLucibello]

The integration test failures could be real

[ToucheSir]

NeuralPDE failure is strictly on downstream and not us, kicking the tires again to see if DynamicPPL fixes itself per #1114 (comment).

[mzgubic]

Perhaps we could add a note in the docs about these deprecations pointing to CRC, or keep the autodocs and add pointers in the docstrings?

Good idea, I've added a note to the docs.

The integration test failures could be real

NeuralPDE.jl seems to be failing with the same error as master.

DynamicPPL fails locally for me (but CI runs). Maybe @devmotion could advise whether there are any special requirements on running tests locally?

[devmotion]

Maybe @devmotion could advise whether there are any special requirements on running tests locally?

No, there shouldn't. I assume locally you don't run them with the latest release of DistributionsAD, most likely because you pinned or checked out some packages or (possibly unintentially) created a Manifest.toml file.

[mzgubic]

DynamicPPL seems to have been fixed. Good to go? I don't have merge rights so please just merge when ready.

[ToucheSir]

Done, thanks!