worker/koji-finalize: always report status back to composer and Koji

Enhance the `koji-finalize` job implementation to use deferred function
to ensure that the job status is always reported back to the composer.
In addition, if the `JobError` is set, also fail the Koji job.

Previously, composer and Koji were not updated in some corner cases when
the job would fail.

internal/worker/clienterrors/errors.go

@@ -29,6 +29,7 @@ const (
 	ErrorJobDependency        ClientErrorCode = 26
 	ErrorJobMissingHeartbeat  ClientErrorCode = 27
 	ErrorTargetError          ClientErrorCode = 28
+	ErrorParsingJobArgs       ClientErrorCode = 29
 )
 
 type ClientErrorCode int