Fix the issue of the system permission management page retrieving non-existent users.

[klboke]

What's the purpose of this PR

This pr has two changes as follows.

• Retrieve user information from the user service API using the user ID obtained from the user permission table to avoid displaying non-existent user IDs on the page.
• Sort the retrieved user list to make the page display more user-friendly when there are a large number of users retrieved.

Trigger scenario description: We switched from the local user system to LDAP. When a user in LDAP is deleted, it is not deleted synchronously. It is expected that there should be no user ID that does not exist in the system. When I try to delete this user ID, the check for the existence of the deleted user is triggered, so this is very contradictory.

[nobodyiam]

Please also fix the unit test.

[codecov]

Codecov Report

Merging #4802 (15322aa) into master (c6dfe76) will decrease coverage by 0.06%.
The diff coverage is 100.00%.

@@             Coverage Diff              @@
##             master    #4802      +/-   ##
============================================
- Coverage     47.29%   47.24%   -0.06%     
  Complexity     1660     1660              
============================================
  Files           346      346              
  Lines         10683    10684       +1     
  Branches       1063     1064       +1     
============================================
- Hits           5053     5048       -5     
- Misses         5322     5328       +6     
  Partials        308      308              

Impacted Files	Coverage Δ
.../spi/defaultimpl/DefaultRolePermissionService.java	69.23% <100.00%> (+0.26%)	⬆️

... and 2 files with indirect coverage changes

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[nobodyiam]

LGTM