add v7 upgrade handler (backport #2106)

[mergify]

Changelist

Adds v7 upgrade handler + test setup

Test Plan

[Describe how this PR was tested (if applicable)]

Author/Reviewer Checklist

• If this PR has changes that result in a different app state given the same prior state and transaction list, manually add the state-breaking label.
• If the PR has breaking postgres changes to the indexer add the indexer-postgres-breaking label.
• If this PR isn't state-breaking but has changes that modify behavior in PrepareProposal or ProcessProposal, manually add the label proposal-breaking.
• If this PR is one of many that implement a specific feature, manually label them all feature:[feature-name].
• If you wish to for mergify-bot to automatically create a PR to backport your change to a release branch, manually add the label backport/[branch-name].
• Manually add any of the following labels: refactor, chore, bug.

Summary by CodeRabbit

• New Features

  • Introduced upgrade handlers for version 7.0.0, enhancing the upgrade process.
  • Added a new package for version 7.0.0, defining upgrade constants and structures.

• Bug Fixes

  • Updated logic to prevent duplicate upgrade handler registrations.

• Tests

  • Implemented a comprehensive testing framework for the state upgrade process, ensuring functionality during transitions.

• Documentation

  • Updated version numbers to reflect the transition from v6.0.0 to v7.0.0, indicating significant improvements and changes.

---

This is an automatic backport of pull request #2106 done by [Mergify](https://mergify.com).

[mergify]

Cherry-pick of fedf6e4 has failed:

On branch mergify/bp/release/protocol/v6.x/pr-2106
Your branch is up to date with 'origin/release/protocol/v6.x'.

You are currently cherry-picking commit fedf6e49.
  (fix conflicts and run "git cherry-pick --continue")
  (use "git cherry-pick --skip" to skip this patch)
  (use "git cherry-pick --abort" to cancel the cherry-pick operation)

Changes to be committed:
	modified:   protocol/app/upgrades.go
	deleted:    protocol/app/upgrades/v6.0.0/upgrade_container_test.go
	new file:   protocol/app/upgrades/v7.0.0/constants.go
	new file:   protocol/app/upgrades/v7.0.0/upgrade.go
	new file:   protocol/app/upgrades/v7.0.0/upgrade_container_test.go
	modified:   protocol/testing/containertest/preupgrade_genesis.json

Unmerged paths:
  (use "git add/rm <file>..." as appropriate to mark resolution)
	deleted by us:   protocol/testing/version/VERSION_CURRENT
	deleted by us:   protocol/testing/version/VERSION_FULL_NAME_PREUPGRADE
	deleted by us:   protocol/testing/version/VERSION_PREUPGRADE

To fix up this pull request, you can check it out locally. See documentation: https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/reviewing-changes-in-pull-requests/checking-out-pull-requests-locally

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