chore: Remove mbt from the CI

[p-offtermatt]

Description

Closes: #N/A

MBT is currently deprecated, and the tests fail regularly starting with the upgrade to Cosmos sdk v50.

This PR removes the MBT tests from the nightly CI pipeline, since it is currently failing. I believe we should keep the code, since it could still be useful for future work.

For more context, see https://github.com/cosmos/interchain-security/issues/1987 for a brief overview of the future plans for randomized testing.

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Summary by CodeRabbit

• Chores
  • Removed the model-based testing job from the workflow configuration.

[coderabbitai[bot]]

Walkthrough

The recent changes removed a specific job, test-mbt, from the GitHub Actions workflow file. This job involved setting up Go and Node environments to run model-based tests (MBT) and was conditioned to run based on changes in particular files. The deletion streamlines the CI pipeline by eliminating this segment.

Changes

Files	Change Summary
.github/workflows/test.yml	Removed the test-mbt job, including associated setup, dependency installations, test execution, and artifact archiving steps.

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