Fix quotes with schema default values (#6968)

* Added quote trimming to schema default values

* Add return type to stripQuotes function

Co-authored-by: rijkvanzanten <rijkvanzanten@me.com>

packages/schema/src/utils/strip-quotes.ts

@@ -0,0 +1,16 @@
+/**
+ * Strip leading/trailing quotes from a string
+ */
+export function stripQuotes(value: string | null): string | null {
+	if (value == null) {
+		return null;
+	}
+
+	const trimmed = value.trim();
+
+	if ((trimmed.startsWith(`'`) && trimmed.endsWith(`'`)) || (trimmed.startsWith('"') && trimmed.endsWith('"'))) {
+		return trimmed.slice(1, -1);
+	}
+
+	return value;
+}