[BACKEND] Update email template in webhook

[bcho892]

Is your feature request related to a problem? Please describe.\

Link to requested template

It might be a good idea for the dates to mention its for the nights not day

You might have to fetch the users first_name and last_name using the UserDataService to fill out the name

It would be wise to create a file JUST for email templates for modularity

BEFORE MERGING

• [ ] Integration test written for services
• [ ] Schemas annotated if adding new models
• [ ] Code generation run (hint: yarn workspace server tsoa spec-and-routes)
• [ ] Appropriate mocks created where possible
• [ ] PR Reviewed (For non-trivial changes)
• [ ] Changes tested after rebasing on master or merging in master (hint: git fetch origin master:master, then git rebase master or git merge master)
• [ ] All required PR checks passing