Please reconsider. If you delete your MB account your thousands of ratings and tags will be gone too.
Jira is a separate account but depending on how you signed up it may be coupled to your MB or GitHub account (via OAuth)
For autoeditor elections reo extracts the email addresses from the MB users table and uses the bulkmail script to send the mails.
If you are worried about auto-editor privileges you can have them revoked. (Which will also be done for inactive accounts if mails are bouncing)