Chore: Move isEmail helper (#23489)

app/livechat/client/views/app/tabbar/visitorTranscript.js

app/utils/client/index.js

app/utils/lib/isEmail.js

client/views/account/AccountProfileForm.js

client/views/admin/emailInbox/EmailInboxForm.js

client/views/admin/mailer/Mailer.js

client/views/admin/users/InviteUsers.js

client/views/admin/users/UserForm.js

client/views/omnichannel/departments/EditDepartment.js

...hannel/directory/contacts/contextualBar/ContactNewEdit.js

...views/room/contextualBar/ExportMessages/MailExportForm.js

lib/utils/isEmail.ts