Add diff.compareEntry helper to compare attribute entries

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- Use it to compare the entry attributes for all entry types.
  Allows comparing differences in file attributes among the
  contents of two directories. This is useful for verifying
  restored contents in end-to-end tests.

- Print message about modified entries only when both entries
  are files and they are being compared.

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Gitea Version: 1.28.0+dev-477-g8b6ad49a5f