Show email on the user popover

What does this MR do and why?

In the group and project member pages, show the email on the user's popover.

Backend MR: Allow group Owners to view enterprise users ema... (!141789 - merged)

Relates to #423493 (closed)

MR acceptance checklist

Please evaluate this MR against the MR acceptance checklist. It helps you analyze changes to reduce risks in quality, performance, reliability, security, and maintainability.

Screenshots or screen recordings

Before	After

How to set up and validate locally

1. Go to /groups/flightjs/-/group_members
2. Hover over one user
3. Apply this patch or apply the backend MR curl https://gitlab.com/gitlab-org/gitlab/-/merge_requests/141789 | git apply

diff --git a/app/assets/javascripts/members/index.js b/app/assets/javascripts/members/index.js
index ad477d8b4b6b..781a7451b9ec 100644
--- a/app/assets/javascripts/members/index.js
+++ b/app/assets/javascripts/members/index.js
@@ -30,6 +30,8 @@ export const initMembersApp = (el, options) => {
     ...vuexStoreAttributes
   } = parseDataAttributes(el);
 
+  vuexStoreAttributes.user.members.forEach((member) => (member.user.email = 'my@email.com'));
+
   const modules = Object.keys(MEMBER_TYPES).reduce((accumulator, namespace) => {
     const namespacedOptions = options[namespace];

4. Repeat steps #1 and #2