Fix backups stopping due to read timeouts (#12281)
Fix backups stopping due to read timeouts (#12281)

* Make BackupService resilient to read timeouts

If an attachment read times out, assume that the resources is
inaccessible and continue the backup without it. This fixes #12280.

* Both errors on one line

Ryanaka/mastodon,dunn/mastodon,gol-cha/mastodon,tootsuite/mastodon,masto-donte-com-br/mastodon,abcang/mastodon,koba-lab/mastodon,Kirishima21/mastodon,cobodo/mastodon,koba-lab/mastodon,gol-cha/mastodon,theoria24/mastodon,danhunsaker/mastodon,MitarashiDango/mastodon,Kirishima21/mastodon,glitch-soc/mastodon,imas/mastodon,ykzts/mastodon,Nyoho/mastodon,tri-star/mastodon,lindwurm/mastodon,Nyoho/mastodon,dunn/mastodon,gol-cha/mastodon,theoria24/mastodon,tootsuite/mastodon,lynlynlynx/mastodon,pinfort/mastodon,yi0713/mastodon,imas/mastodon,tootcafe/mastodon,lynlynlynx/mastodon,ykzts/mastodon,tootcafe/mastodon,cobodo/mastodon,tri-star/mastodon,dunn/mastodon,kirakiratter/mastodon,rainyday/mastodon,danhunsaker/mastodon,Ryanaka/mastodon,im-in-space/mastodon,Kirishima21/mastodon,theoria24/mastodon,tootsuite/mastodon,yukimochi/mastodon,ykzts/mastodon,musashino205/mastodon,cobodo/mastodon,gol-cha/mastodon,kazh98/social.arnip.org,cobodo/mastodon,maa123/mastodon,abcang/mastodon,glitch-soc/mastodon,lindwurm/mastodon,musashino205/mastodon,primenumber/mastodon,Kirishima21/mastodon,kazh98/social.arnip.org,im-in-space/mastodon,pinfort/mastodon,primenumber/mastodon,lindwurm/mastodon,h3zjp/mastodon,yi0713/mastodon,ikuradon/mastodon,yukimochi/mastodon,tri-star/mastodon,ykzts/mastodon,dunn/mastodon,koba-lab/mastodon,Ryanaka/mastodon,kazh98/social.arnip.org,lindwurm/mastodon,Nyoho/mastodon,MitarashiDango/mastodon,imas/mastodon,koba-lab/mastodon,yi0713/mastodon,musashino205/mastodon,imas/mastodon,MitarashiDango/mastodon,lynlynlynx/mastodon,primenumber/mastodon,rainyday/mastodon,rainyday/mastodon,Nyoho/mastodon,tri-star/mastodon,ikuradon/mastodon,danhunsaker/mastodon,tootcafe/mastodon,masto-donte-com-br/mastodon,im-in-space/mastodon,glitch-soc/mastodon,yukimochi/mastodon,theoria24/mastodon,rainyday/mastodon,yi0713/mastodon,tootcafe/mastodon,kirakiratter/mastodon,pinfort/mastodon,im-in-space/mastodon,abcang/mastodon,yukimochi/mastodon,ikuradon/mastodon,lynlynlynx/mastodon,danhunsaker/mastodon,tootsuite/mastodon,h3zjp/mastodon,kirakiratter/mastodon,maa123/mastodon,maa123/mastodon,primenumber/mastodon,MitarashiDango/mastodon,kazh98/social.arnip.org,h3zjp/mastodon,pinfort/mastodon,kirakiratter/mastodon,musashino205/mastodon,masto-donte-com-br/mastodon,ikuradon/mastodon,Ryanaka/mastodon,h3zjp/mastodon,abcang/mastodon,glitch-soc/mastodon,masto-donte-com-br/mastodon,maa123/mastodon