Silence Rake task backtraces

Silence Rake task backtraces, similar to Rails::BacktraceCleaner.
Application lines are preserved, but all other lines are hidden.

This also affects unrecognized tasks, causing the backtrace to be hidden
entirely.  Closes #39524.
Co-authored-by: NPetrik <petrik@deheus.net>

railties/lib/rails/commands/rake/rake_command.rb

@@ -19,6 +19,9 @@ def perform(task, args, config)
             load "rails/tasks.rb"
             rake.init("rails", [task, *args])
             rake.load_rakefile
+            if Rails.respond_to?(:root)
+              rake.options.suppress_backtrace_pattern = /\A(?!#{Regexp.quote(Rails.root.to_s)})/
+            end
             rake.standard_exception_handling { rake.top_level }
           end
         end

railties/test/application/rake_test.rb

@@ -25,6 +25,22 @@ def test_gems_tasks_are_loaded_first_than_application_ones
       assert $task_loaded
     end
 
+    test "task backtrace is silenced" do
+      add_to_config <<-RUBY
+        rake_tasks do
+          task :boom do
+            raise "boom"
+          end
+        end
+      RUBY
+
+      backtrace = rails("boom", allow_failure: true).lines.grep(/:\d+:in /)
+      app_lines, framework_lines = backtrace.partition { |line| line.start_with?(app_path) }
+
+      assert_not_empty app_lines
+      assert_empty framework_lines
+    end
+
     test "task is protected when previous migration was production" do
       with_rails_env "production" do
         rails "generate", "model", "product", "name:string"