ci: Add interchaintests for delegator governance

[dasanchez]

Description

Added a set of tests for delegator governance user stories.

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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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• Provided a link to the relevant issue or specification
• Reviewed "Files changed" and left comments if necessary
• Confirmed all CI checks have passed

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• Confirmed the correct type prefix in the PR title
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• Confirmed that this PR does not change production code

[dasanchez]

Replacing with a PR from a cosmos/gaia repo branch.