605 enhance email confirmation

[DavidCuentasMar]

Critical Changes

• new field: Summit_Events__c.Ask_Email_Confirmation__c
• read/write access from "Summit_Events_Admin" on "Ask_Email_Confirmation__c"
• read access from "Summit_Events_Registrant" on "Ask_Email_Confirmation__c"

Changes

• New HTM slot with new confirmation input in summiteventsregister.page (rendered depending on Ask_Email_Confirmation__c)
• Check if email input value is the same as confirm-email input value (This validation is executed after current empty/required fields are checked)
• Summit_Events_Record_Page updated to display new field

Issues Closed

• [FEATURE] Confirm email address in registration process #605