feat(xo-server/xo-web/health): detect invalid vhd-parent VDIs

[MathieuRA]

Screenshot

Check list

Check if done, if not relevant leave unchecked.

• PR reference the relevant issue (e.g. Fixes #007 or See xoa-support#42)
• if UI changes, a screenshot has been added to the PR
• documentation updated
• CHANGELOG.unreleased.md:
  • enhancement/bug fix entry added
  • list of packages to release updated (${name} v${new version})
• I have tested added/updated features (and impacted code)
  • unit tests (e.g. cron/parse.spec.js)
  • if xo-server API changes, the corresponding test has been added to/updated on xo-server-test
  • at least manual testing

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[MathieuRA]

@julien-f Is that what you expected?
I don't have the possibility to test, I'm not sure that it treats the problem as you wanted.