chore(*): add mathlib4 synchronization comments (#18072)
Regenerated from the [port status wiki page](https://github.com/leanprover-community/mathlib/wiki/mathlib4-port-status).
Relates to the following files:
* `algebra.tropical.basic`
* `algebra.tropical.lattice`
* `data.list.basic`
* `data.list.infix`
* `data.list.lemmas`
* `data.list.min_max`
* `data.list.palindrome`
* `data.list.tfae`
* `data.set.intervals.ord_connected_component`
* `order.concept`
