Function resolve_string_list

Resolve a list of strings that may contain `${{ }}` template expressions. Each element is resolved via [`resolve_string_with_expression`]. If an element is *solely* a `${{ expr }}` expression and the referenced value is a JSON array (e.g. from state or params), the array items are expanded inline into the result list. This enables patterns like: ```yaml include: - "${{ state.files }}" # e

(
    items: &[String],
    params: &HashMap<String, Value>,
    state: &HashMap<String, Value>,
    matrix_values: Option<&HashMap<String, Value>>,
    steps: Option<&HashMap<String, HashMap<String,