Add Reports summary

[olblak]

This refactors the way the main engine is working in order to save different stage results and display a summary at the end of the run.

.Example

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REPORTS:

⚠ CORE-LINUX-PACKAGING.DIGEST
	Source:
		✔  Docker Image Published on Registry(dockerDigest)
	Condition:
		✔  microsoft/azure-cli docker image tag(yaml)
		✔  microsoft/azure-cli docker image tag(yaml)
	Target:
		⚠  microsoft/azure-cli docker image tag(yaml)
		⚠  microsoft/azure-cli docker image tag(yaml)
		⚠  microsoft/azure-cli docker image tag(yaml)

⚠ CORE-LINUX-PACKAGING
	Source:
		✔  (githubRelease)
	Condition:
		✔  Docker image name is azure-cli(yaml)
		✔  Docker Image Published on Registry(dockerImage)
	Target:
		⚠  microsoft/azure-cli docker image tag is updated(yaml)



Run Summary
===========

2 job run
0 job succeed
0 job failed
2 job applied changes