Use truncate_all instead of DatabaseCleaner

Performance tests show both methods of truncating the database take
about the same time, so we can remove one dependency and we don't lose
anything in the process.

Gemfile

@@ -72,7 +72,6 @@ end
 group :development, :test do
   gem "bullet", "~> 6.1.4"
   gem "byebug", "~> 11.1.3"
-  gem "database_cleaner", "~> 2.0.1"
   gem "factory_bot_rails", "~> 6.2.0"
   gem "faker", "~> 2.18.0"
   gem "i18n-tasks", "~> 0.9.34"

Gemfile.lock

@@ -168,12 +168,6 @@ GEM
     crass (1.0.6)
     daemons (1.4.0)
     dalli (2.7.11)
-    database_cleaner (2.0.1)
-      database_cleaner-active_record (~> 2.0.0)
-    database_cleaner-active_record (2.0.1)
-      activerecord (>= 5.a)
-      database_cleaner-core (~> 2.0.0)
-    database_cleaner-core (2.0.1)
     delayed_job (4.1.9)
       activesupport (>= 3.0, < 6.2)
     delayed_job_active_record (4.1.6)
@@ -730,7 +724,6 @@ DEPENDENCIES
   coveralls (~> 0.8.23)
   daemons (~> 1.4.0)
   dalli (~> 2.7.11)
-  database_cleaner (~> 2.0.1)
   delayed_job_active_record (~> 4.1.6)
   devise (~> 4.8.0)
   devise-security (~> 0.16.0)

db/dev_seeds.rb

@@ -1,7 +1,4 @@
-unless Rails.env.test?
+ActiveRecord::Tasks::DatabaseTasks.truncate_all unless Rails.env.test?
-  require "database_cleaner"
-  DatabaseCleaner.clean_with :truncation
-end
 @logger = Logger.new(STDOUT)
 @logger.formatter = proc do |_severity, _datetime, _progname, msg|
                       msg unless @avoid_log

spec/spec_helper.rb

@@ -45,7 +45,7 @@ RSpec.configure do |config|
     example.run
     self.use_transactional_tests = true
 
-    DatabaseCleaner.clean_with(:truncation)
+    ActiveRecord::Tasks::DatabaseTasks.truncate_all
     Rails.application.load_seed
   end