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/web/repo/actions/view.go

@@ -644,7 +644,6 @@ func ArtifactsDownloadView(ctx *context_module.Context) {
 	writer := zip.NewWriter(ctx.Resp)
 	defer writer.Close()
 	for _, art := range artifacts {
-
 		f, err := storage.ActionsArtifacts.Open(art.StoragePath)
 		if err != nil {
 			ctx.Error(http.StatusInternalServerError, err.Error())