This PR sends a job_status field in the init-post status report so that we will be able to more accurately measure our SLOs (see internal backlinked issue for more).

To populate this field, the change:

• sets the job status environment variable to Failure or ConfigurationError the first time an error has been established. This is already checked for in the getActionsStatus method that is called when we establish status of each individual action, so we additionally set the environment variable at this time.
• in the init-post Action, if the ANALYZE_DID_COMPLETE_SUCCESSFULLY environment variable was not true, and the job status environment variable was not already set, we set it to ConfigurationError. This catches the case shown in the submit SARIF after failure PR check, where the failure occurs within the job but outside of the Action steps where we send status reports. We consider this a configuration error for the purposes of telemetry as these steps are not owned by the Action.
• We also explicitly set the environment variable to Success if ANALYZE_DID_COMPLETE_SUCCESSFULLY is true. Note that in the case where analyze was successful, but some step between analyze and the init-post action fails, we'll incorrectly mark the job status as Success. Presumably this is a very uncommon scenario though 🤔
• sends the value of this environment variable, or Unknown if not previously populated, to the init-post status report.

At each step, if the environment variable already has a value, we never override it.

I logged the job status in a debug statement to confirm that the appropriate statuses are being sent as expected:

• Success: successful run log
• Failure: debug artifacts failure run (failure in analyze step) log
• Configuration Error: submit SARIF after run (failure occurs in step where we do not send a status report) log

Merge / deployment checklist

• Confirm this change is backwards compatible with existing workflows.
• Confirm the readme has been updated if necessary.
• Confirm the changelog has been updated if necessary.