Sponsorship Admin Page - Send Notifications/Emails: Add archive 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 archive option for email templates
• Add “hidden” or “archived” field to object, add filter with default on django admin view

Reason for change

• Helps sort notifications sent in past years/no longer needed

Priority 3. Low

Date Needed Sponsorship Launch

Additional context

[augdiebold]

Working on that one!