Remove `require 'active_support'` from individual modules

Let users require `active_support` before loading any ActiveSupport modules.
http://guides.rubyonrails.org/active_support_core_extensions.html

refs #15167

FYI, the remains

```
$ git grep "require ['|\"]active_support['|\"]" activesupport/
activesupport/bin/generate_tables:  require 'active_support'
activesupport/lib/active_support/all.rb:require 'active_support'
activesupport/test/abstract_unit.rb:require 'active_support'
```