Add release qual script for performing a chain upgrade (backport #3044)

[mergify]

Changelist

• Add a script for upgrading staging for release qual

Test Plan

• Tested with v9.0 release

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

  • Introduces a release qualification tool to submit software upgrade proposals on test networks. Supports CLI and environment configuration, calculates upgrade height, requires confirmation, enforces safety checks to block mainnet, auto-submits proposals, casts “yes” votes with test validators, and reports final status.

• Documentation

  • Adds a README with setup requirements, usage examples, configuration precedence, supported chain/node settings, validator list, and safety guidance for testnet/staging-only use.

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This is an automatic backport of pull request #3044 done by [Mergify](https://mergify.com).

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