Convert more responses to SuccessResponse. Fixes #2860 (#4058)

api_tests/package.json

api_tests/src/community.spec.ts

api_tests/src/post.spec.ts

api_tests/src/shared.ts

api_tests/yarn.lock

crates/api/src/community/add_mod.rs

crates/api/src/community/ban.rs

crates/api/src/community/block.rs

crates/api/src/local_user/add_admin.rs

crates/api/src/local_user/ban_person.rs

crates/api/src/local_user/block.rs

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

crates/api/src/site/block.rs

crates/api/src/site/purge/comment.rs

crates/api/src/site/purge/community.rs

crates/api/src/site/purge/person.rs

crates/api/src/site/purge/post.rs

crates/api_common/src/community.rs

crates/api_common/src/custom_emoji.rs

crates/api_common/src/person.rs