Enable more revive linter rules (#30608)

Noteable additions:

- `redefines-builtin-id` forbid variable names that shadow go builtins
- `empty-lines` remove unnecessary empty lines that `gofumpt` does not
remove for some reason
- `superfluous-else` eliminate more superfluous `else` branches

Rules are also sorted alphabetically and I cleaned up various parts of
`.golangci.yml`.

models/user/user.go

@@ -988,9 +988,8 @@ func GetUserIDsByNames(ctx context.Context, names []string, ignoreNonExistent bo
 		if err != nil {
 			if ignoreNonExistent {
 				continue
-			} else {
-				return nil, err
 			}
+			return nil, err
 		}
 		ids = append(ids, u.ID)
 	}