Retry temporary rclone backend errors #5251
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What does this PR change? What problem does it solve?
rclone backends apparently sometimes temporarily report a file as missing even though it actually exists. This results in problems with the backend error redesign in restic 0.17.0, which relies on accurate information about missing files. Thus this PR reintroduces a limited number of retries when using rclone as backend.
Was the change previously discussed in an issue or on the forum?
Fixes https://forum.restic.net/t/data-does-not-exist-check-successful-on-second-attempt-but-restic-returns-non-zero-error-code/9117
Fixes https://forum.restic.net/t/fatal-repository-contains-errors-when-only-errors-are-successfully-retried-operations/8971
Checklist
[ ] I have added documentation for relevant changes (in the manual).changelog/unreleased/that describes the changes for our users (see template).