Annotate remaining hardcoded blank?/present?/presence return values

[bdewater]

After https://github.com/Shopify/rbi-central/pull/182#issuecomment-1783127074 decided to complete the set. blank? is defined and present? and presence and derived from there.

• [ ] Add RBI for a new gem
• [x] Modify RBI for an existing gem
• [ ] Other:

Changes

• Gem name: Active Support
• Gem source:
  • https://github.com/rails/rails/blob/7-1-stable/activesupport/lib/active_support/core_ext/object/blank.rb
  • https://github.com/rails/rails/blob/7-1-stable/activesupport/lib/active_support/core_ext/date/blank.rb
  • https://github.com/rails/rails/blob/7-1-stable/activesupport/lib/active_support/core_ext/date_time/blank.rb
  • https://github.com/rails/rails/blob/7-1-stable/activesupport/lib/active_support/time_with_zone.rb#L504-L507