feat: set defaults for `--v2-upgrade-height` #6310

Job	Run time
lint / golangci-lint	2m 48s
markdown-linter / markdown-link-check	2m 27s
lint / yamllint	4s
test / test	11m 2s
test / test-short	4m 7s
markdown-linter / markdown-lint	6s
test / test-coverage	5m 17s
test / test-fuzz	5m 41s
test / test-race	7m 46s
goreleaser / goreleaser-check	1m 39s
lint / hadolint / hadolint	9s
goreleaser / goreleaser	0s
	41m 6s

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