fix(gnovm/softfloat): replace copy.sh with Go generator

[omarsy]

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[Gno2D2]

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[moul]

Related with #3578

[jefft0]

@omarsy , can you add a description for this PR? The PR title has a lot of details. Maybe simplify the PR title and put details in the description.

[thehowl]

I think this could call gofumpt directly, actually, as we do in misc/genstd/genstd.go.