Add option to overwrite the files on cache extraction #1891
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When using GNU tar, if a file already exists, from a previous run or another cached action, it results in a slew of warning messages.
This change adds the use of --overwrite when using GNU tar so that any existing file will just be overwritten.
Similar issue was fixed in the @actions/tool-cache package, but not in @actions/cache: https://github.com/actions/toolkit/pull/807/files#diff-725a5ef102ee3762738a5500c3d7c5b6afef874a1cb67c55085ad5e4615b1a6f
This PR supersedes #1704