Checks all golden file comparisons in the GN build graph.
usage: fx check-goldens [--list] [--regex] [SEARCH_TERM] Reruns golden file checks in the current build, relying on the "golden_files" build API module. That is, unless `--list` is passed, in which case this command only prints out the associated goldens. The goldens may be filtered by a substring of their source path (e.g., a full source-relative directory) or by a regular expression; if no search term is provided, all accessible golden files will be matched. TODO(crbug.com/gn/301): This command may deal in stale metadata. Until this bug is resolved, users must take care to make sure their build metadata is up to data (e.g., via `fx gen`) before invoking this command. --list just list the matched goldens; do not perform any checks. --regex if set, the search term will be matched as a regular expression.