fix: Avoid error when files are changed during tar

[DerDreschner]

Our own runners are painfully slow. This lead to race-conditions that must be handled. This PR fixes one of those for the saveState function, that creates a tar file and is being run as beforeEach during some tests in cypress.

Output of such a failed run:

  3 passing (2m)
  1 failing

  1) files_sharing: Public share - downloading files
       folder share
         "before all" hook for "Can download all files":
     CypressError: `cy.exec('docker exec --user www-data --workdir /var/www/html  nextcloud-e2e-test-server_server bash -c "tar cf /var/www/html/data-la3dmc.tar ./data"')` failed because the command exited with a non-zero code.

Pass `{failOnNonZeroExit: false}` to ignore exit code failures.

Information about the failure:
Code: 1

Stderr:
tar: ./data: file changed as we read it

https://on.cypress.io/exec

Because this error occurred during a `before all` hook we are skipping the remaining tests in the current suite: `folder share`
      at <unknown> (http://localhost:8042/__cypress/runner/cypress_runner.js:121543:77)
      at tryCatcher (http://localhost:8042/__cypress/runner/cypress_runner.js:1777:23)
      at Promise._settlePromiseFromHandler (http://localhost:8042/__cypress/runner/cypress_runner.js:1489:31)
      at Promise._settlePromise (http://localhost:8042/__cypress/runner/cypress_runner.js:1546:18)
      at Promise._settlePromise0 (http://localhost:8042/__cypress/runner/cypress_runner.js:1591:10)
      at Promise._settlePromises (http://localhost:8042/__cypress/runner/cypress_runner.js:1671:18)
      at _drainQueueStep (http://localhost:8042/__cypress/runner/cypress_runner.js:2377:12)
      at _drainQueue (http://localhost:8042/__cypress/runner/cypress_runner.js:2370:9)
      at Async._drainQueues (http://localhost:8042/__cypress/runner/cypress_runner.js:2386:5)
      at Async.drainQueues (http://localhost:8042/__cypress/runner/cypress_runner.js:2256:14)

To handle that error, tar is now being configured to ignore those issues. As the exit code is still 1, we have to modify that to treat it as 0 to keep cypress running in that case and not aborting the whole test suite.

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