cosmwasm: added shutdown contracts tests

[kakucodes]

Description

This PR adds comprehensive test coverage for the shutdown cw-wormhole contract, which serves as a safety mechanism for temporarily disabling the main contract in case of security incidents. The changes include both interchain integration tests and cw-multi-test based tests.

Changes

• Added interchain integration tests validating disabled functionality post-shutdown
• Implemented cw-multi-test based unit tests for the shutdown contract

Purpose

This test coverage addition is a preliminary step before upcoming modifications to the cw-wormhole contract's state management. Having thorough test coverage in place will help ensure the safety and correctness of the future state management changes that are needed.

Test Scenarios

• Contract migration to shutdown state
• Verification of disabled message handlers
• State preservation during shutdown

This pr was created jointly with @joelsmith-2019 where he contributed the ICT tests and I focused on the cw-multi-test

[joelsmith-2019]

Only reviewed the CosmWasm tests as I was responsible for writing the interchain tests.

[joelsmith-2019]

Re-approving the CosmWasm tests

[djb15]

Could you just confirm the reason for adding the cfg_attr lines in the source files? I'm assuming it's to prevent the compiler from optimising those functions out for the tests?

[kakucodes]

Could you just confirm the reason for adding the cfg_attr lines in the source files? I'm assuming it's to prevent the compiler from optimising those functions out for the tests?

Hey @djb15, the cfg_attrs are to quell the lint/clippy warnings that were arising when running the tests with no default features where those code paths are unused.

[djb15]

Tests look good! Also confirmed that cfg_attr does what's intended (adding allow(dead_code) when default features disabled for testing)