Replace IdentityUserLookupAppService by an integration service

[hikalkan]

Resolved #17736

[codecov]

Codecov Report

Merging #17737 (ced61b4) into dev (357f9be) will decrease coverage by 0.02%.
Report is 12 commits behind head on dev.
The diff coverage is 76.19%.

@@            Coverage Diff             @@
##              dev   #17737      +/-   ##
==========================================
- Coverage   53.49%   53.47%   -0.02%     
==========================================
  Files        3037     3039       +2     
  Lines       94937    94967      +30     
==========================================
+ Hits        50783    50788       +5     
- Misses      44154    44179      +25     

Files	Coverage Δ
...tity/Integration/IdentityUserIntegrationService.cs	92.85% <91.42%> (+92.85%)	⬆️
.../Volo/Abp/Identity/IdentityUserLookupAppService.cs	0.00% <0.00%> (-91.67%)	⬇️

... and 3 files with indirect coverage changes

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