fix: show "System" for system users, instead of "User ID n" where n is the project's number in the order. (#7734)

Fixes a bug introduced with the new tooltips where the system user was
shown as "User ID n" instead of "System". The "n" in this case is
actually the user's index number in the list of project owners
(including duplicates).

There's a few things happening: 
1. Change the object for system owners: use `name` instead of
`description`. At the same time, remove the `description` property
completely because it's not used at the moment.
2. Remove the assignnment of `id: objectId(user)` to the user sent to
the User Avatar component. This was a leftover from when we split out
the AvatarGroup component, and is not something we use anymore.

Before:

![image](https://github.com/user-attachments/assets/bd348daf-c81e-4ea9-b8a9-f10af71a0da7)

After:

![image](https://github.com/user-attachments/assets/d147f7c7-d683-43ac-9ee2-6116f155dad6)

frontend/src/component/common/AvatarGroup/AvatarGroup.tsx

@@ -74,10 +74,7 @@ const GroupCardAvatarsInner = ({
     return (
         <StyledAvatars>
             {shownUsers.map((user) => (
-                <AvatarComponent
-                    key={objectId(user)}
-                    user={{ ...user, id: objectId(user) }}
-                />
+                <AvatarComponent key={objectId(user)} user={user} />
             ))}
             <ConditionallyRender
                 condition={users.length > avatarLimit}

frontend/src/component/project/NewProjectCard/ProjectOwners/ProjectOwners.tsx

@@ -18,7 +18,6 @@ const useOwnersMap = () => {
         name: string;
         imageUrl?: string;
         email?: string;
-        description?: string;
     } => {
         if (owner.ownerType === 'user') {
             return {
@@ -30,12 +29,10 @@ const useOwnersMap = () => {
         if (owner.ownerType === 'group') {
             return {
                 name: owner.name,
-                description: 'group',
             };
         }
         return {
-            name: '',
-            description: 'System',
+            name: 'System',
             imageUrl: `${uiConfig.unleashUrl}/logo-unleash.png`,
         };
     };
@@ -76,11 +73,7 @@ export const ProjectOwners: FC<IProjectOwnersProps> = ({ owners = [] }) => {
             </StyledContainer>
             <ConditionallyRender
                 condition={owners.length === 1}
-                show={
-                    <StyledUserName>
-                        {users[0]?.name || users[0]?.description}
-                    </StyledUserName>
-                }
+                show={<StyledUserName>{users[0]?.name}</StyledUserName>}
                 elseShow={<div />}
             />
         </>