pr05 Typescript Migration 12: Migrate server files related to emailing/nodemailer -- REBUILD

[clairep94]

Rebuild of #3648 due to issues rebasing, no changes from that branch & have addressed later feedback

Changes:

• Migrate /server/views files related to emailing
• Migrate /server/utils/mail
• Extract types to /server/types/email.ts from existing logic & nodemailer types

Other:

• Took a look at /migrations/emailConsolidation, but this requires the User and Project models to be migrated first, which I'll do next

I have verified that this pull request:

• has no linting errors (npm run lint)
• has no test errors (npm run test)
• is from a uniquely-named feature branch and is up to date with the develop branch.
• is descriptively named and links to an issue number, i.e. Fixes #123

[clairep94]

@khanniie @raclim
I rebuilt this bc I did something funny on my branch trying to merge develop into it. this is an exact rebuild of that branch, having addressed the final feedback

[khanniie]

thank you so much!!

[raclim]

This is great, will merge this in!