refactor: x/upgrade audit changes

[likhita-809]

Description

ref : #14187

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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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[sonarcloud]

[Cosmos SDK] Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
1 Code Smell

No Coverage information
No Duplication information

[julienrbrt]

lgtm!
Not sure why the proto break check fails here as it is related to this PR: #14144

[julienrbrt]

Merging this, be we should improve upgrade app config. I'll do it in my audit: #14209 (comment)