chore: remove crescent stATOM/ATOM pool

[zarazan]

Description

This pool has been removed from the Crescent API - removing it from the umee config

closes: #XXXX

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Author Checklist

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I have...

• included the correct type prefix in the PR title
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• added a changelog entry to CHANGELOG.md
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• confirmed the correct type prefix in the PR title
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• reviewed state machine logic
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• reviewed tests and test coverage
• manually tested (if applicable)