extend/pathname: restore old rmtree behaviour

Library/.rubocop.yml

@@ -221,7 +221,7 @@ Performance/MethodObjectAsBlock:
 
 RSpec:
   Include:
-    - 'Homebrew/test/**/*'
+    - "Homebrew/test/**/*"
 
 # Intentionally disabled as it doesn't fit with our code style.
 RSpec/AnyInstance:
@@ -284,6 +284,7 @@ Sorbet/TrueSigil:
     - "/**/{Formula,Casks}/**/*.rb"
     - "**/{Formula,Casks}/**/*.rb"
     - "Homebrew/test/**/*.rb"
+    - "Homebrew/extend/pathname/rmtree.rb"
 
 # Require &&/|| instead of and/or
 Style/AndOr:

Library/Homebrew/extend/pathname.rb

@@ -584,3 +584,5 @@ def uninstall_info
     puts "uninfo #{self}" if ObserverPathnameExtension.verbose?
   end
 end
+
+require "extend/pathname/rmtree"

Library/Homebrew/extend/pathname/rmtree.rb

@@ -0,0 +1,15 @@
+# typed: false
+# frozen_string_literal: true
+
+class Pathname
+  # Like regular `rmtree`, except it never ignores errors.
+  #
+  # This was the default behaviour in Ruby 3.1 and earlier.
+  #
+  # @api public
+  def rmtree(noop: nil, verbose: nil, secure: nil)
+    # odeprecated "rmtree", "FileUtils#rm_r"
+    FileUtils.rm_r(@path, noop:, verbose:, secure:)
+    nil
+  end
+end