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`.

cmd/hook.go

@@ -465,7 +465,7 @@ func hookPrintResult(output, isCreate bool, branch, url string) {
 		fmt.Fprintf(os.Stderr, "  %s\n", url)
 	}
 	fmt.Fprintln(os.Stderr, "")
-	os.Stderr.Sync()
+	_ = os.Stderr.Sync()
 }
 
 func pushOptions() map[string]string {