Remove @adjoints for sort and filter

[lkdvos]

This removes the definitions of sort and filter, as these are covered by ChainRules.
This also fixes #1492 , as the ChainRules rrule for sort includes all keywords.

[devmotion]

This also fixes #1492 , as the ChainRules rrule for sort includes all keywords.

I think it would be good to add a test for #1492.

[darsnack]

The Molly.jl failure seems real, but the downstream test set is complex/foreign enough that I can't decipher where sort or filter are used. @jgreener64 can you confirm that this change is causing the failures and where?

[jgreener64]

That test does fail sometimes due to stochasticity, I should improve it. The Molly CI run for the latest commit seems fine though, so this change doesn't seem to break anything.

[lkdvos]

I think in that case this is ready for review + merge, unless I need to add something else?