Function render_ignore_patterns 

pub fn render_ignore_patterns(
    git_config: Option<&GitConfig>,
    vars: Option<&TemplateVars>,
) -> (Vec<String>, Vec<String>)

Render ignore patterns (both ignore_tags and ignore_tag_prefixes) through the template engine when template_vars is provided.

Returns two vecs: (rendered_ignore_tags, rendered_ignore_tag_prefixes). When vars is None, patterns are returned as-is (unrendered).