Add frontend validation to Billing Contact email
Problem
Following test case TC-NN-1: https://gitlab.com/gitlab-org/customers-gitlab-com/-/work_items/8003#note_1680050770, a bug was uncovered:
Proposal
With [Key Contacts Management] Add validation on bac... (#8153 - closed), we'll add validation for the backend. This issue should tackle adding it in the frontend to make the experience better for the user.
Edited by Michael Lunøe