Ensure submissions tablib.Dataset generation doesn't crash

[sergei-maertens]

Closes #3629

Changes

• Added regression tests for repeating group and file upload components that can cause the submission export to crash.
• Ensure that (hidden/skipped) submission steps because of logic are not skipped during export
• Ensure that editgrid components are considered a single component during export instead of recursing into them

Checklist

Check off the items that are completed or not relevant.

• Impact on features

  • [x] Checked copying a form
  • [x] Checked import/export of a form
  • [x] Config checks in the configuration overview admin page
  • [x] Problem detection in the admin email digest is handled

• Release management

  • [x] I have labelled the PR as "needs-backport" accordingly

• I have updated the translations assets (you do NOT need to provide translations)

  • [x] Ran ./bin/makemessages_js.sh
  • [x] Ran ./bin/compilemessages_js.sh

• Commit hygiene

  • [x] Commit messages refer to the relevant Github issue
  • [x] Commit messages explain the "why" of change, not the how

[sergei-maertens]

Looks like only the openforms.formio.rendering.tests.test_component_node.FormNodeTests.test_export_always_emits_all_nodes test broke because of this patch, and I'm fairly certain that test is just wrong :)

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 96.56%. Comparing base (97d32bc) to head (02c68e5). Report is 3 commits behind head on master.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #4752 +/- ## ======================================= Coverage 96.56% 96.56% ======================================= Files 746 746 Lines 25191 25202 +11 Branches 3313 3318 +5 ======================================= + Hits 24325 24336 +11 Misses 602 602 Partials 264 264 ```

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[sergei-maertens]

Backports:

• 2.8.x: ed7de9dd9a041399c95f5dde0046bd7f3a954d3e
• 2.7.x: 99ccd27de9cdadad7dc6bef0f9adc2710cb7c549