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refactor: move theorems about lists from mathlib #756

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refactor: move theorems about lists from mathlib #756

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Commits on Jun 15, 2024

  1. refactor: move theorems about lists from mathlib 

    * `List.isEmpty_iff_eq_nil` and `List.modifyHead_modifyHead` are from
  `Mathlib.Data.List.Basic`. I removed the `simp` priority and `nolint`
  attribute from `modifyHead_modifyHead` because we don't need them
  anymore.
* `List.cons_prefix_cons` is from `Mathlib.Data.List.Infix`. Its
  previous name was `List.cons_prefix_iff`.

We need these theorems to prove `String.splitOn_of_valid`. See
leanprover-community#756.

Co-authored-by: Kim Morrison <kim@tqft.net>
    @chabulhwi @semorrison
    chabulhwi and semorrison committed Jun 15, 2024
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