Grant control of auto-apply suggestions configuration to auto-apply high relevance only or both

• Updated the settings form to display both high and medium relevance levels. This will display when the auto_apply option is ticked.
• Updated the config/schema to add in a type and default values
• If none is selected it will default to applying both relevance levels
• Created a hook which will set the default value for existing users of the module Closes #3402319