[Task]: Migrate `ics-poc` -> `main`

[n2p5]

The repository as it stands currently is forked from v7.x.x cosmos/intechain-security. Once we land our "mega pr" into ics-poc and we've done our initial testing with AtomOne we will want ics-poc to become the new main, the old main like the old tags will live under the legacy/XXX namespace, so that

• brach: legacy/main<- the old main from cosmos/interchain-security upstream
• tag: legacy/v7.0.1 <- the upstream tag for v7.0.1, this allows us to keep a history of ICS while not being stuck on the old SEMVER naming that was there before.