Enhanced traceback capture for SAS failures

[collinss-jpl]

Description

• This branch enhances the error reporting from SAS failures by utilizing a regular expression to capture a full traceback stack from the log, rather than just the last 20 lines.

Affected Issues

• Resolves [New Feature]: Enhanced Traceback capture for failed SAS subprocess #423

Testing

• Unit test for a failing SAS condition has been updated to ensure the full traceback (which is longer than 20 lines in this test) is now provided in the error message that would be reported to an SDS end user.

[JimHofman]

Looks good.