chore: remove Data/UnionFind (#14556)

Its implementation has been improved in `lean4lean` and `batteries`; the mathlib implementation can be removed in favour of these.

Searching github for 'import Mathlib.Data.UnionFind' only yields forks of mathlib (either explicit or manual); hence this seems safe to remove without a deprecation period.

Author: grunweg

Mathlib.lean

@@ -2419,7 +2419,6 @@ import Mathlib.Data.TypeMax
 import Mathlib.Data.TypeVec
 import Mathlib.Data.UInt
 import Mathlib.Data.ULift
-import Mathlib.Data.UnionFind
 import Mathlib.Data.Vector.Basic
 import Mathlib.Data.Vector.Defs
 import Mathlib.Data.Vector.MapLemmas

Mathlib/Data/UnionFind.lean

@@ -26,9 +26,6 @@
  ["docBlame", "RightDistributive"],
  ["docBlame", "RightIdentity"],
  ["docBlame", "RightInverse"],
- ["docBlame", "UFModel"],
- ["docBlame", "UFNode"],
- ["docBlame", "UnionFind"],
  ["docBlame", "Writer"],
  ["docBlame", "WriterT"],
  ["docBlame", "Xor'"],
@@ -393,31 +390,8 @@
  ["docBlame", "Traversable.mapFold"],
  ["docBlame", "Tree.unitRecOn"],
  ["docBlame", "Trivialization.baseSet"],
- ["docBlame", "UFModel.Agrees"],
- ["docBlame", "UFModel.Models"],
- ["docBlame", "UFModel.empty"],
- ["docBlame", "UFModel.parent"],
- ["docBlame", "UFModel.push"],
- ["docBlame", "UFModel.rank"],
- ["docBlame", "UFModel.setParent"],
- ["docBlame", "UFModel.setParentBump"],
- ["docBlame", "UFNode.parent"],
- ["docBlame", "UFNode.rank"],
- ["docBlame", "UFNode.value"],
  ["docBlame", "ULiftable.congr"],
  ["docBlame", "UniformFun.phi"],
- ["docBlame", "UnionFind.arr"],
- ["docBlame", "UnionFind.empty"],
- ["docBlame", "UnionFind.find"],
- ["docBlame", "UnionFind.findAux"],
- ["docBlame", "UnionFind.link"],
- ["docBlame", "UnionFind.mkEmpty"],
- ["docBlame", "UnionFind.push"],
- ["docBlame", "UnionFind.rank"],
- ["docBlame", "UnionFind.rankMax"],
- ["docBlame", "UnionFind.rankMaxAux"],
- ["docBlame", "UnionFind.size"],
- ["docBlame", "UnionFind.union"],
  ["docBlame", "UnivLE.witness"],
  ["docBlame", "Valued.v"],
  ["docBlame", "Vector3.unexpandCons"],

scripts/nolints.json

@@ -2,7 +2,6 @@ Mathlib/Data/BinaryHeap.lean : line 7 : ERR_MOD : Module docstring missing, or t
 Mathlib/Data/ByteArray.lean : line 7 : ERR_MOD : Module docstring missing, or too late
 Mathlib/Data/QPF/Multivariate/Basic.lean : line 75 : ERR_LIN : Line has more than 100 characters
 Mathlib/Data/String/Lemmas.lean : line 10 : ERR_MOD : Module docstring missing, or too late
-Mathlib/Data/UnionFind.lean : line 9 : ERR_MOD : Module docstring missing, or too late
 Mathlib/Init/Data/Int/Basic.lean : line 11 : ERR_MOD : Module docstring missing, or too late
 Mathlib/Init/Data/Nat/Basic.lean : line 10 : ERR_MOD : Module docstring missing, or too late
 Mathlib/Init/Data/Nat/Lemmas.lean : line 13 : ERR_MOD : Module docstring missing, or too late