feat: set defaults for `--v2-upgrade-height` #6308

Job	Run time
goreleaser / goreleaser-check	1m 44s
lint / golangci-lint	2m 50s
lint / yamllint	7s
markdown-linter / markdown-link-check	2m 23s
test / test	10m 57s
markdown-linter / markdown-lint	8s
test / test-coverage	5m 14s
test / test-fuzz	5m 38s
test / test-race	7m 38s
test / test-short	4m 11s
lint / hadolint / hadolint	6s
goreleaser / goreleaser	0s
	40m 56s

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