fix(graph): Don't use hardcoded groupOfNames in group creation

[3l0w]

Description

Use OCIS_LDAP_GROUP_OBJECTCLASS when creating a group

Related Issue

• Fixes #11775

Motivation and Context

In my homelab setup we use groupOfUniqueNames instead of groupOfNames

How Has This Been Tested?

• Tested in the homelab setup with an external openldap server, example of the setup can be found in the linked issue
• Created a group using the web ui, checked if the group has the correct attributes in the openldap

Types of changes

• [x] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)
• [ ] Technical debt
• [ ] Tests only (no source changes)

Checklist:

• [x] Code changes
• [ ] Unit tests added
• [ ] Acceptance tests added
• [ ] Documentation ticket raised: