[Bug]: [privilege_group] The built in privilege groups are not listed using interface "list_privilege_groups()"

[binbinlv]

Is there an existing issue for this?

• I have searched the existing issues

Environment

- Milvus version: master-20241120-c73ca14a-amd64
- Deployment mode(standalone or cluster):both
- MQ type(rocksmq, pulsar or kafka):    all
- SDK version(e.g. pymilvus v2.0.0rc2): 2.5.0rc126
- OS(Ubuntu or CentOS): 
- CPU/Memory: 
- GPU: 
- Others:

Current Behavior

The built in privilege groups are not listed using interface "list_privilege_groups()"

>>> role.list_privilege_groups()
[]

Expected Behavior

list all the built in privilege groups

Steps To Reproduce

from pymilvus import Role
from pymilvus import connections
connections.connect()
role = Role("newRole")
role.create()
role.list_privilege_groups()
[]

Milvus Log

No response

Anything else?

No response

[binbinlv]

/assign @shaoting-huang
/unassign @yanliang567

[sre-ci-robot]

@binbinlv: GitHub didn't allow me to assign the following users: shaoting-huang.

Note that only milvus-io members, repo collaborators and people who have commented on this issue/PR can be assigned. Additionally, issues/PRs can only have 10 assignees at the same time.
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In response to this:

/assign @shaoting-huang
/unassign @yanliang567

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.

[shaoting-huang]

/assign

[binbinlv]

The built in roles could be listed using "utility.list_roles(True)", so I think here should keep the consistent. And it will be more convenient for users to get the detail of the built in privilege groups.

>>> utility.list_roles(True)
RoleInfo groups:
- RoleItem: <role_name:admin>, <users:()>
- RoleItem: <role_name:public>, <users:()>

[binbinlv]

Verified and fixed:
pymilvus: 2.5.0rc126
milvus: master-20241122-bc131a91-amd64

>>> res = role.list_privilege_groups()
>>> len(res)
9