chore(README): update v2 info and new diagrams #1624

Job	Run time
backend-integration	5s
check-mdtoc	6s
check-license	4s
check-doc-links	34s
progress-report	1m 15s
python-lint	14s
python-unittest (3.8)	2m 9s
run-go-unittests	3m 22s
python-unittest (3.9)	1m 2s
run-pipelineloop-unittests	3m 18s
run-v2-custom-controller-image-builds	6s
python-unittest (3.10)	1m 3s
validate-testdata	3m 17s
python-unittest (3.11)	1m 8s
	17m 43s

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