Rollup merge of #145471 - rs-sac:extr, r=the8472

Stabilize BTree{Map,Set}::extract_if

Tracking issue: rust-lang/rust#70530
FCP completed: rust-lang/rust#70530 (comment)
Closes: rust-lang/rust#70530

Author: jhpratt

tests/pass/btreemap.rs

@@ -1,7 +1,6 @@
 //@revisions: stack tree
 //@[tree]compile-flags: -Zmiri-tree-borrows
 //@compile-flags: -Zmiri-strict-provenance
-#![feature(btree_extract_if)]
 use std::collections::{BTreeMap, BTreeSet};
 use std::mem;