cloudapi: run all Koji compose unit tests

Previously, only a subset from all Koji Compose unit test cases were
run. Remove this limitation and run all defined unit tests, which were
copied from `kojiapi`.

In addition, fix unit tests and relevant cloudapi methods to make unit
tests pass.

Add `TestRouteWithReply()` to `test/helpers.go` to allow getting the
compose ID when submitting a new compose. This is needed to make some
unit tests deterministic.

Do not delete values from `fields` slice in `dropFields()` in
`test/helpers.go`. The behavior was previously not consistent.
If the top-level map contained the value, it was deleted from it, but
the nested maps also contained the value, it was not deleted. On the
other hand, if the top level map didn't contain the value, but nested
maps did contain it, the value was deleted from all nested maps.

internal/cloudapi/v2/handler.go

@@ -689,6 +689,10 @@ func imageStatusFromKojiJobStatus(js *worker.JobStatus, initResult *worker.KojiI
 		return ImageStatusValueFailure
 	}
 
+	if buildResult.OSBuildOutput != nil && !buildResult.OSBuildOutput.Success {
+		return ImageStatusValueFailure
+	}
+
 	return ImageStatusValueSuccess
 }
 
@@ -725,6 +729,10 @@ func composeStatusFromKojiJobStatus(js *worker.JobStatus, initResult *worker.Koj
 		if buildResult.JobError != nil {
 			return ComposeStatusValueFailure
 		}
+
+		if buildResult.OSBuildOutput != nil && !buildResult.OSBuildOutput.Success {
+			return ComposeStatusValueFailure
+		}
 	}
 
 	if result.JobError != nil {