Crash in the cleanup addon on XLIFF files

[sentry-io]

Sentry Issue: WEBLATE-4KK

ValueError: Element is not a child of this node.
(6 additional frame(s) were not displayed)
...
  File "weblate/addons/base.py", line 156, in post_configure
    self.post_update(component, "")
  File "weblate/addons/base.py", line 334, in post_update
    self.update_translations(component, previous_head)
  File "weblate/addons/cleanup.py", line 141, in update_translations
    translation.store,
  File "weblate/addons/cleanup.py", line 120, in update_lisa
    storage.store.body.remove(unit.xmlelement)
  File "src/lxml/etree.pyx", line 943, in lxml.etree._Element.remove

[nijel]

This happens when XLIFF groups are used, related to #2482

[github-actions]

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