Sponsorship Admin Page - Send Notifications/Emails: Add copy option for email templates

[oliviasauls]

Location of change python.org/admin/sponsors/sponsoremailnotificationtemplate/ - Admin/Sponsorships/Sponsor Email Notification Templates

Describe the solution you'd like Add copy option for email templates

Reason for change Improves workflow/speeds up process of sending notifications to multiple sponsors at a time

Priority 3. Low

Date Needed Sponsorship Launch

Additional context