chore(test): replace MkdirTemp and os.TempDir with t.TempDir (#298)

Vitali Tatarintevrequested to merge
298-use-testing-TempDir into master

Replaces usages of os.TempDir and os.MkdirTemp with t.TempDir.

Contributes to #298 (closed)

Based on this commit (83337b8a) I think the current minimal version of Go is higher than 1.15 thus this refactoring can be applied.

Edited by Vitali Tatarintev

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