removed partner confirmation email on registration

[jerryxu99]

🎟️ Ticket(s): Closes # https://www.notion.so/ubcbiztech/b24732925a6745caa305a2c746fa5ba7?v=d557178d0a134acf85a3890882538364&p=f2f9d527942547818b4b35459b33903a&pm=s

👷 Changes: A brief summary of what changes were introduced.

removes emails to partners on registration of an event

💭 Notes: Any additional things to take into consideration. linked to frontend change: https://github.com/ubc-biztech/bt-web/pull/494

• this is merging into allan's branch

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• [ ] Serverless tests are passing (Check travis build logs, CI is currently broken)
• [ ] PR is has approving review(s)