When customUpCodes mark an HTTPError as up, parse the response body, apply advancedMatcher.validate, and set status to statusUp && matchResult.ok. Return parsed payload and extracted values to match the success path.
Adds a customUpCodes field to the monitor schema to allow users to specify which HTTP status codes should be treated as UP instead of DOWN. Includes core logic in HttpProvider and unit tests.
Refs #3657
Alex Holliday
harsh-aghara