chore(*): add mathlib4 synchronization comments (#18772)
Regenerated from the [port status wiki page](https://github.com/leanprover-community/mathlib/wiki/mathlib4-port-status).
Relates to the following files:
* `algebra.module.projective`
* `algebra.order.rearrangement`
* `analysis.convex.function`
* `analysis.locally_convex.polar`
* `category_theory.Fintype`
* `category_theory.abelian.functor_category`
* `category_theory.sites.plus`
* `category_theory.triangulated.pretriangulated`
* `category_theory.triangulated.rotate`
* `category_theory.triangulated.triangulated`
* `control.fold`
* `data.finset.sups`
* `data.list.to_finsupp`
* `data.num.lemmas`
* `field_theory.finiteness`
* `field_theory.mv_polynomial`
* `linear_algebra.alternating`
* `linear_algebra.dimension`
* `linear_algebra.free_module.finite.basic`
* `order.height`
* `set_theory.zfc.ordinal`
* `topology.algebra.module.weak_dual`
* `topology.local_at_target`
* `topology.metric_space.contracting`
* `topology.metric_space.pi_nat`
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