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`.

routers/api/actions/artifacts.go

@@ -144,7 +144,6 @@ func ArtifactContexter() func(next http.Handler) http.Handler {
 
 			var task *actions.ActionTask
 			if err == nil {
-
 				task, err = actions.GetTaskByID(req.Context(), tID)
 				if err != nil {
 					log.Error("Error runner api getting task by ID: %v", err)