feat!: migrate ICS legacy props in upgrade handler (#3299)

* migrate ConsumerAdditionProposal

* migrate legacy props

* bump ICS

* Update app/upgrades/v20/upgrades.go

Co-authored-by: insumity <karolos@informal.systems>

* fix linter

* change epoch condition

* fix ICS integration tests

* fix typo

* bump ICS

* bump ICS

* metadata validation

* bump ICS

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Co-authored-by: insumity <karolos@informal.systems>