fix: RegisterLegacyAminoCodec should error if Msg name is >39 chars

[blushi]

Description

Closes: #10870

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Author Checklist

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I have...

• included the correct type prefix in the PR title
• added ! to the type prefix if API or client breaking change
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• followed the guidelines for building modules
• included the necessary unit and integration tests
• added a changelog entry to CHANGELOG.md
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Reviewers Checklist

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I have...

• confirmed the correct type prefix in the PR title
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• reviewed state machine logic
• reviewed API design and naming
• reviewed documentation is accurate
• reviewed tests and test coverage
• manually tested (if applicable)

[amaury1093]

LGTM

[tac0turtle]

may need a changelog or documentation update to inform people to use this

[blushi]

may need a changelog or documentation update to inform people to use this

added: 1c50161