Create parametrized scopes on Note to remove code duplication

The following discussion from !17818 (merged) should be addressed:

• @nolith started a discussion: (+3 comments)

  Why don't we get the opportunity to get rid of this CodeReuse/ActiveRecord?

  The offenders are

  notes.where('(note LIKE ? OR note LIKE ?)', text, text.capitalize)

  and

  notes.where(note: [text, text.capitalize])

  We may consider adding a couple of parametrized scope in Note like the followings (naming could be improved 😄 )

  scope :for_note, ->(text) { where(note: [text, text.capitalize]) }
  scope :like_note, ->(text) { where('(note LIKE ? OR note LIKE ?)', text, text.capitalize) }