fix(xo-server/snapshot): allow self user that is member of a group to snapshot

[pdonias]

See Zammad#18478

Description

VM snapshot: when the VM belongs to a Resource Set, we explicitly bypass SR
permission check for users that are members of that Resource Set to allow them
to snapshot their VMs. But we only checked if the user is in the subjects list
of the Resource Set and forgot to also check the groups the user belongs to.

Checklist

• Commit
  • Title follows commit conventions
  • Reference the relevant issue (Fixes #007, See xoa-support#42, See https://...)
  • If bug fix, add Introduced by
• Changelog
  • If visible by XOA users, add changelog entry
  • Update "Packages to release" in CHANGELOG.unreleased.md
• PR
  • If UI changes, add screenshots
  • If not finished or not tested, open as Draft