test(fuzz): appease goimports by renaming added .go corpus files to *go_fuzz

[odeke-em]

goimports doesn't provide an ignore pattern except by reading the $GOPATH/.goimportsignore which would be too cumbersome and non-standard to muck around with so instead this change modifies testdata/corpra/.go to testdata/corpora/.go_fuzz so that goimports won't throw a fit against CI/CD for this project.

Fixes #3601

[Gno2D2]

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[odeke-em]

Thank you @n2p5