chore(README): update v2 info and new diagrams (#1423) #1625

Job	Run time
check-license	6s
backend-integration	8s
check-mdtoc	5s
check-doc-links	32s
progress-report	1m 16s
python-lint	16s
python-unittest (3.8)	1m 2s
python-unittest (3.9)	1m 8s
python-unittest (3.10)	1m 0s
python-unittest (3.11)	1m 0s
run-pipelineloop-unittests	3m 13s
run-go-unittests	3m 22s
run-v2-custom-controller-image-builds	4s
validate-testdata	3m 13s
	16m 25s

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