[mlaetitia]

Related to T51ENG-2307

Proposed changes

• Port Stop other forms creating supporter posts, and add a command to clean them up [Develop] #251 and Supporter cleanup: match junk supporters whatever their author #257 to main.
• Only the "OSAID Endorsement" form creates supporters, and never one without a name.
• Show the endorsement type to admins as an "Endorsement type" radio.
• Add wp osi-supporter-cleanup to remove the supporters other forms created.

Why are these changes being made?

• Every valid submission of any form became a pending supporter. Since the newsletter moved into the footer, that's ~480 empty ones a day.
• The 05 Nov production backup has 90,145 pending supporters. 1,764 have a type and are real; the rest came from the newsletter, Salons RSVPs and other forms.

Testing instructions

• After deploy, sign up to the footer newsletter: no new supporter.
• Before the cleanup, export the tables from the SSH home (outside htdocs): wp db export ~/supporters-backup-$(date +%Y%m%d%H%M).sql --tables=wp_posts,wp_postmeta
• wp osi-supporter-cleanup: dry run, expect ~88.4k plus signups since 05 Nov.
• wp osi-supporter-cleanup --force --dry-run=false --yes | tee ~/supporter-cleanup.log
• Expect 177 published and 1,764 pending supporters left.

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