chore(*): add mathlib4 synchronization comments (#18202)
Regenerated from the [port status wiki page](https://github.com/leanprover-community/mathlib/wiki/mathlib4-port-status).
Relates to the following files:
* `algebra.gcd_monoid.finset`
* `algebra.hom.centroid`
* `combinatorics.set_family.compression.down`
* `control.equiv_functor.instances`
* `data.fin.tuple.basic`
* `data.fin_enum`
* `data.finset.lattice`
* `data.finset.n_ary`
* `data.finset.nat_antidiagonal`
* `data.finset.pairwise`
* `data.finset.powerset`
* `data.finset.sigma`
* `data.fintype.list`
* `data.fintype.sigma`
* `data.list.of_fn`
* `data.matrix.dmatrix`
* `data.real.basic`
* `data.real.sign`
* `group_theory.congruence`
* `group_theory.perm.support`
* `order.grade`
* `order.hom.bounded`
* `order.sup_indep`
* `ring_theory.congruence`
