chore: Add EMAIL_FROM_NAME to .env.example

[nicostuhlfauth]

This PR adds the EMAIL_FROM_NAME field to the .env.example file.

Why? To maintain consistency in the "From" field of outgoing emails. Without setting EMAIL_FROM_NAME, emails may appear with different senders, such as Cal.com <[email protected]> or LoggedInUser <[email protected]>.

After some trial and error, I discovered that both EMAIL_FROM and EMAIL_FROM_NAME need to be defined for consistent email formatting, though this was not previously documented. Adding this to the example environment file ensures that developers are aware of it and can set it appropriately.