Add Bacalhau job ID parse helper

[bgins]

In #175 we added a check for errors in the output of bacalhau create --id-only --wait path/to/job/spec:

lilypad/pkg/executor/bacalhau/bacalhau.go

Lines 198 to 200 in 90a248d

	splitOutputs := strings.Split(string(runOutputRaw), "\n")
	runOutput := splitOutputs[0]
	outputError := strings.Join(strings.Fields(strings.Join(splitOutputs[1:], " ")), " ")

We would like to refactor the parsing into a helper function. In addition, we should add tests to check that the parsing works as expected.