Fix casing of vitess migration syntax and comments printing

[dbussink]

The canonical form of printing the vitess migration syntax would upcase the UUID value, but it needs to be passed through unchanged.

This in turn led me to testing comments in a query as well and it turns out we wrongly change the case there as well.

Related Issue(s)

#10203

Checklist

• "Backport me!" label has been added if this change should be backported
• Tests were added or are not required
• Documentation was added or is not required

[github-actions]

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