✨ Add --skip-errors option to continue scans on check/probe failures

[jimjag]

What kind of change does this PR introduce?

Feature.

• PR title follows the guidelines defined in our pull request documentation

What is the current behavior?

If a single check or probe fails with a runtime error (for example a transient GitHub API failure such as a 404 on ListWorkflowRunsByFileName), the entire scan aborts and no results are reported. This is especially disruptive when scanning many repositories with --repos or --org, where one transient failure fails the whole run.

Example:

Check Packaging failed for evergage/mongodb_exporter: internal error: ... 404 Not Found []
Error: one or more checks failed during execution

What is the new behavior (if this is a feature change)?

Adds a --skip-errors option. When set, if one or more checks or probes fail at runtime, Scorecard continues running the remaining checks/probes and reports results for everything that succeeded. Failures are logged to stderr and the command exits with a zero status.

• Adds the SkipErrors option and --skip-errors CLI flag.

• Threads skipErrors through scorecard.Run into the probe and raw-data collection paths, so a failure skips only the affected item instead of aborting the run.

• Suppresses the "one or more checks failed" error (non-zero exit) when --skip-errors is set.

• Tests for the changes have been added (for bug fixes/features)

Which issue(s) this PR fixes

NONE

Special notes for your reviewer

The public scorecard.Run API is unchanged; a new WithSkipErrors option was added and defaults to false, so existing callers (serve, cron, attestor, scdiff) keep their current behavior. The default CLI behavior is also unchanged unless --skip-errors is passed.

Does this PR introduce a user-facing change?

Yes — a new optional --skip-errors CLI flag. Default behavior is unchanged.

Add a `--skip-errors` option that continues a scan when individual checks or probes fail at runtime, reporting results for everything that succeeded instead of aborting the whole run.