Move `into_forall_wand_pure` to the right file.

4 jobs for gen_proofmode in 15 minutes and 53 seconds (queued for 3 seconds)
Status Job ID Name Coverage
  Build
passed #13692
fp
build-coq.8.7.1

00:05:31

passed #13691
fp-timing
build-coq.8.7.2

00:04:25

passed #13690
fp-timing
build-coq.8.8.0

00:04:22

passed #13689
fp
build-coq.dev

00:15:53