feat(xo-server/rest-api): ability to delete group

[MelissaFrncJrg]

Description

DELETE /rest/v0/groups/<id>

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

Review process

This 2-passes review process aims to:

• develop skills of junior reviewers
• limit the workload for senior reviewers
• limit the number of unnecessary changes by the author

1. The author creates a PR.
2. Review process:
   1. The author assigns the junior reviewer.
   2. The junior reviewer conducts their review:
      • Resolves their comments if they are addressed.
      • Adds comments if necessary or approves the PR.
   3. The junior reviewer assigns the senior reviewer.
   4. The senior reviewer conducts their review:
      • If there are no unresolved comments on the PR → merge.
      • Otherwise, we continue with 3.
3. The author responds to comments and/or makes corrections, and we go back to 2.

Notes:

1. The author can request a review at any time, even if the PR is still a Draft.
2. In theory, there should not be more than one reviewer at a time.
3. The author should not make any changes:
   • When a reviewer is assigned.
   • Between the junior and senior reviews.

[MathieuRA]

Please add in the PR description a small example of the request call.
See #8276 (comment)

[MathieuRA]

app.deleteGroup can throw, so this needs to be handled, otherwise the request will return an internal server error, and will not help the end user.
Something like this should work and be enough for now:

        try {
          await app.deleteGroup(id)
          res.status(204) // HTTP status 204  -> success
        } catch (error) {
          res.json({ error: error.message })
          if (noSuchObject.is(error)) {
            res.status(404) // HTTP status 404 -> resource not found (so the group with the given id was not found)
          } else {
            res.status(500) // HTTP status 500 -> internal server error (unhandled error in this case)
          }
        }
        res.send()