Remove dead internal app-icon versioning task (#25806)

The `assets:check` Rake task generated a version-stamped internal app icon
via `Scripts/BuildPhases/AddVersionToIcons.sh`, falling back to copying
`AppIcon.appiconset` into `AppIcon-Internal.appiconset` when the script
failed. All three are already gone — the script was deleted and the app
icons moved to `Sources/*/Resources/Assets.xcassets/` (targets use
`AppIconLegacy`) — so the task's skip-guard globbed a path that no longer
exists, ran on every `rake dependencies`, and printed a spurious `cp`
error when the deleted source appiconset wasn't found.

Remove the task, unwire it from `dependencies`, and drop the stale
`.gitignore` entries for the generated internal-icon paths.

ImageMagick, Ghostscript, and RMagick are left in place — they back the
promo-screenshots lane, not this task.

Author: jkmassel

.gitignore

@@ -60,7 +60,6 @@ WordPress/WordPress.xcodeproj/xcuserdata
 WordPress/Derived Sources/
 # coverage.py
 */CoverageData/*
-WordPress/Images.xcassets/AppIcon-Internal.appiconset
 
 # Dependencies
 vendor
@@ -86,10 +85,6 @@ Scripts/fastlane/
 # CI Artifacts Location
 Artifacts
 
-# Generated Internal Icons
-WordPress/Resources/AppImages.xcassets/AppIcon-Internal.appiconset
-WordPress/Resources/Icons-Internal
-
 # All encrypted secrets should be stored under .configure-files
 # Everything without a .enc extension is ignored
 .configure-files/*

Rakefile

@@ -14,7 +14,7 @@ PROJECT_DIR = __dir__
 abort('Project directory contains one or more spaces – unable to continue.') if PROJECT_DIR.include?(' ')
 
 desc 'Install required dependencies'
-task dependencies: %w[dependencies:check assets:check dependencies:gutenberg_xcframeworks]
+task dependencies: %w[dependencies:check dependencies:gutenberg_xcframeworks]
 
 namespace :dependencies do
   task check: %w[ruby:check bundler:check bundle:check credentials:apply]
@@ -100,19 +100,6 @@ bundle exec fastlane run configure_apply force:true
   end
 end
 
-namespace :assets do
-  task :check do
-    next unless Dir['WordPress/Resources/AppImages.xcassets/AppIcon-Internal.appiconset/*.png'].empty?
-
-    Dir.mktmpdir do |tmpdir|
-      puts 'Generate internal icon set'
-      if system("export PROJECT_DIR=#{Dir.pwd}/WordPress && export TEMP_DIR=#{tmpdir} && ./Scripts/BuildPhases/AddVersionToIcons.sh >/dev/null 2>&1") != 0
-        system("cp #{Dir.pwd}/WordPress/Resources/AppImages.xcassets/AppIcon.appiconset/*.png #{Dir.pwd}/WordPress/Resources/AppImages.xcassets/AppIcon-Internal.appiconset/")
-      end
-    end
-  end
-end
-
 CLOBBER << 'vendor'
 
 desc 'Checks the source for style errors. Lints the whole project, or only the given paths: rake lint[path1,path2]'