refactor: limit breaking changes for next version (backport #22972)

[mergify]

Description

With the removal of testutil/integration happening on main soon: #22904
This makes sure some helpers that are still useful do not get deleted, nor change place between main (0.54) and 0.52

Additionally, check-compat script has been supersede by https://github.com/cosmos/nightly-stack/blob/main/.github/workflows/build-applications.yaml

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Summary by CodeRabbit

• New Features
  • Introduced a new CreateMultiStore function to enhance testing capabilities for store management.
• Bug Fixes
  • Updated test files to utilize the new CreateMultiStore function, ensuring compatibility and improved functionality.
• Documentation
  • Marked the old CreateMultiStore function as deprecated, redirecting usage to the updated utility for better organization.
• Chores
  • Removed compatibility check script and associated GitHub Actions workflow.

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This is an automatic backport of pull request #22972 done by [Mergify](https://mergify.com).

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