Get child permissions by parent instead name.

[maliming]

https://support.abp.io/QA/Questions/6463

[codecov]

Codecov Report

Attention: 19 lines in your changes are missing coverage. Please review.

Comparison is base (bee6450) 51.59% compared to head (2ebbf01) 51.59%.
Report is 3 commits behind head on rel-8.0.

Files	Patch %	Lines
.../ProjectBuilding/Building/Steps/ChangeThemeStep.cs	0.00%	18 Missing ⚠️
...tBuilding/Templates/App/AppNoLayersTemplateBase.cs	0.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           rel-8.0   #18743      +/-   ##
===========================================
- Coverage    51.59%   51.59%   -0.01%     
===========================================
  Files         3074     3074              
  Lines        97122    97124       +2     
  Branches      7733     7733              
===========================================
- Hits         50114    50109       -5     
- Misses       45467    45474       +7     
  Partials      1541     1541              

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