[fix](auth) fix bug that user info may lost when upgrading to 1.2.0

[morningman]

Proposed changes

Issue Number: close #xxx

Problem summary

When upgrading from 1.1.x to 1.2.0, the user info may be lost.(eg, when show all grants, you can not found the user)

Checklist(Required)

1. Does it affect the original behavior:
   • Yes
   • No
   • I don't know
2. Has unit tests been added:
   • Yes
   • No
   • No Need
3. Has document been added or modified:
   • Yes
   • No
   • No Need
4. Does it need to update dependencies:
   • Yes
   • No
5. Are there any changes that cannot be rolled back:
   • Yes (If Yes, please explain WHY)
   • No

Further comments

If this is a relatively large or complex change, kick off the discussion at dev@doris.apache.org by explaining why you chose the solution you did and what alternatives you considered, etc...

[hello-stephen]

TeamCity pipeline, clickbench performance test result:
the sum of best hot time: 36.4 seconds
load time: 687 seconds
storage size: 17123386239 Bytes
https://doris-community-test-1308700295.cos.ap-hongkong.myqcloud.com/tmp/20221218134638_clickbench_pr_64758.html

[yiguolei]

LGTM