chore(derived_code_mappings): Report known issues as non-errors

[armenzg]

This reports the exceptions as warning-level errors rather than error-level.

Deployments do not get paused if the error is warning or lower:

--additional-query="issue.type:error !level:info !level:warning"

Rendering of a warning-level exception:

PS: This is a redo of #76212 but without passing a level, thus, making it an info-level message.