Not leveraging scribe.Emitter functionality

[ForestEckhardt]

Currently in this and many other Python buildpacks you are using the following lines to output the environment:

cpython/build.go

Lines 150 to 153 in fc523d6

	logger.Break()
	logger.Process("Configuring environment")
	logger.Subprocess("%s", scribe.NewFormattedMapFromEnvironment(cpythonLayer.SharedEnv))
	logger.Break()

While this works there is emitter functionality to handle this for you. You can look at the following for an example:
https://github.com/paketo-buildpacks/node-engine/blob/d9d9e73751c125185e4d7b0356ed29b9658816e7/build.go#L165
This handles all of the formatting for all of the environment variables for you and will tell the user whether they are set at build or at launch time.