Make temp table name in positron-duckdb tests more random to avoid sp…

…oradic extension test failures (#5328)

Attempts to address #5308 by making temporary table names in the DuckDB
catalog more random. If this does not fix the issue, then I'm not sure
what else it might be, but we can see if the error recurs elsewhere.

extensions/positron-duckdb/src/test/extension.test.ts

@@ -68,7 +68,7 @@ async function dxExec(rpc: DataExplorerRpc): Promise<any> {
 }
 
 function makeTempTableName(): string {
-	return `positron_${randomUUID().slice(0, 5)}`;
+	return `positron_${randomUUID().replace(/-/g, '')}`;
 }
 
 type InsertColumn = { name: string; type: string; values: Array<string> };