fix: const validation overflow

[petar-dambovaliev]

Closes 3496

[Gno2D2]

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[codecov]

Codecov Report

Attention: Patch coverage is 23.14815% with 83 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
gnovm/pkg/gnolang/values_conversions.go	20.19%	55 Missing and 28 partials ⚠️

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[thehowl]

These are just filetests and I don't get why we should put them here

[thehowl]

What if instead, when we call ConvertTo we set isConst to true when m.PreprocessorMode is true?