Address bugbash issues

[Phantsure]

There were few issues which came up during internal bugbash:

1. With debug logs on restore was failing saying zstd: cache.tar already exists; not overwritten:.
   Possible solutions:

• Add --force to zstd command. Docs say that they overwrite the file with this.
• Delete cache.tar file after every list, create and extract operation
  Final solution: Add --force to zstd command as problem is seen when list runs which happen in debug mode thus justifying extra time taken in deleting and creating cache.tar file using --force.

3. Change debug log to info log when falling back to gzip for restoration of cache on windows.

[lvpx]

LGTM. It would be great to add some context in description as to why you chose the --force method instead of the other suggested ones.