Fix /activity endpoint not require signature in authorized fetch mode (#15592)
Fix /activity endpoint not require signature in authorized fetch mode (#15592)

Fixes #15589

Co-authored-by: Claire <82b964c50e9d1d222e48cf5046e6484a966a7b07@sitedethib.com>
tootsuite/mastodon,h3zjp/mastodon,maa123/mastodon,tootcafe/mastodon,im-in-space/mastodon,yukimochi/mastodon,yi0713/mastodon,ykzts/mastodon,ykzts/mastodon,im-in-space/mastodon,yi0713/mastodon,koba-lab/mastodon,MitarashiDango/mastodon,yukimochi/mastodon,theoria24/mastodon,cobodo/mastodon,cobodo/mastodon,maa123/mastodon,gol-cha/mastodon,ykzts/mastodon,Ryanaka/mastodon,pinfort/mastodon,abcang/mastodon,abcang/mastodon,musashino205/mastodon,tootsuite/mastodon,yukimochi/mastodon,theoria24/mastodon,Ryanaka/mastodon,pinfort/mastodon,ikuradon/mastodon,glitch-soc/mastodon,MitarashiDango/mastodon,imas/mastodon,gol-cha/mastodon,ikuradon/mastodon,Nyoho/mastodon,masto-donte-com-br/mastodon,theoria24/mastodon,Nyoho/mastodon,lindwurm/mastodon,lynlynlynx/mastodon,imas/mastodon,h3zjp/mastodon,cobodo/mastodon,lindwurm/mastodon,Kirishima21/mastodon,im-in-space/mastodon,gol-cha/mastodon,MitarashiDango/mastodon,danhunsaker/mastodon,primenumber/mastodon,Nyoho/mastodon,danhunsaker/mastodon,musashino205/mastodon,tootcafe/mastodon,lindwurm/mastodon,pinfort/mastodon,Ryanaka/mastodon,masto-donte-com-br/mastodon,abcang/mastodon,tootsuite/mastodon,tootcafe/mastodon,primenumber/mastodon,Nyoho/mastodon,lindwurm/mastodon,lynlynlynx/mastodon,koba-lab/mastodon,masto-donte-com-br/mastodon,glitch-soc/mastodon,koba-lab/mastodon,Kirishima21/mastodon,musashino205/mastodon,tootsuite/mastodon,glitch-soc/mastodon,h3zjp/mastodon,Ryanaka/mastodon,Kirishima21/mastodon,lynlynlynx/mastodon,lynlynlynx/mastodon,musashino205/mastodon,yukimochi/mastodon,tootcafe/mastodon,danhunsaker/mastodon,masto-donte-com-br/mastodon,ikuradon/mastodon,primenumber/mastodon,glitch-soc/mastodon,h3zjp/mastodon,ykzts/mastodon,imas/mastodon,MitarashiDango/mastodon,primenumber/mastodon,Kirishima21/mastodon,ikuradon/mastodon,abcang/mastodon,cobodo/mastodon,im-in-space/mastodon,koba-lab/mastodon,yi0713/mastodon,danhunsaker/mastodon,maa123/mastodon,imas/mastodon,yi0713/mastodon,gol-cha/mastodon,theoria24/mastodon,pinfort/mastodon,maa123/mastodon