Show group display name when the group object is not loaded yet

[kesselb]

• Resolves: [Bug]: Display name of group not shown until group object is lazy loaded in user management #56532

Summary

We are fetching the first 25 groups when opening the users list. If a user in that list has a group assigned that was not part of the first 25 groups, then we don't have the displayname.

Until:

• The user opens the edit mode (then all groups are lazy loaded)
• The user scrolls in the group view to load the next batch of groups

STR

Preparation:

• Have more than 25 groups.
• Assign group number 26, 27, etc to a user.

Helper script

for i in {1..30}; do
  occ group:add --display-name "Test Group $i" group$i
done

for i in {31..35}; do
  occ group:add --display-name "Test Group $i" group$i
  occ group:adduser group$i alice
  occ group:adduser group$i bob
  occ group:adduser group$i fry
  occ group:adduser group$i hermes
  occ group:adduser group$i bender
  occ group:adduser group$i professor
done

Case 1:

• Open the user management
• Reload to ensure the local state is clear
• See that some of the groups are not using the display name, but the group id.
• Scroll the list of groups on the left => the group id is replaced by the display name
• This PR: List of groups is using the displayname

Case 2:

• Open the user management
• Reload to ensure the local state is clear
• Open the edit view for a user where the disply name is missing
• See that the list of groups is incomplete
• This PR: List of groups is complete

Checklist

• Code is properly formatted
• Sign-off message is added to all commits
• Tests (unit, integration, api and/or acceptance) are included
• Screenshots before/after for front-end changes
• Documentation (manuals or wiki) has been updated or is not required
• Backports requested where applicable (ex: critical bugfixes)
• Labels added where applicable (ex: bug/enhancement, 3. to review, feature component)
• Milestone added for target branch/version (ex: 32.x for stable32)

[kesselb]

cc @artonge @come-nc @susnux @benjaminfrueh for early feedback as you were involved in the other pr's.

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