This PR adds support for basic telemetry to the start-proxy Action. Due to the nature of start-proxy, we are careful here to:

• Not report error messages and stack traces, if the Action fails. We only report that it fails.
• If the Action succeeds, we only report the types of the registries that are configured and used by CodeQL.

Risk assessment

For internal use only. Please select the risk level of this change:

• Low risk: Changes are fully under feature flags, or have been fully tested and validated in pre-production environments and are highly observable, or are documentation or test only.

Merge / deployment checklist

• Confirm this change is backwards compatible with existing workflows.
• Consider adding a changelog entry for this change.
• Confirm the readme and docs have been updated if necessary.