Get rid of remaining Perform/SendActivity traits (fixes #3670) (#3926)

crates/api/src/community/transfer.rs

crates/api/src/lib.rs

crates/api/src/local_user/add_admin.rs

crates/api/src/local_user/block.rs

crates/api/src/local_user/change_password.rs

crates/api/src/local_user/change_password_after_reset.rs

crates/api/src/local_user/get_captcha.rs

crates/api/src/local_user/list_banned.rs

crates/api/src/local_user/login.rs

crates/api/src/local_user/notifications/list_mentions.rs

crates/api/src/local_user/notifications/list_replies.rs

crates/api/src/local_user/notifications/mark_all_read.rs

crates/api/src/local_user/notifications/mark_mention_read.rs

crates/api/src/local_user/notifications/unread_count.rs

crates/api/src/local_user/report_count.rs

crates/api/src/local_user/reset_password.rs

crates/api/src/local_user/save_settings.rs

crates/api/src/local_user/verify_email.rs

crates/api/src/post/get_link_metadata.rs

crates/api/src/post/mark_read.rs