Add GetPermissionDepthOrDefault method

[realLiangshiwei]

Description

Resolves #18679

Checklist

• I fully tested it as developer / designer and created unit / integration tests
• I documented it (or no need to document or I will create a separate documentation issue)

How to test it?

• Create a tenant
• Login as a tenant user
• Open permission management modal

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (c4a0b46) 51.59% compared to head (df9d171) 51.59%.
Report is 8 commits behind head on rel-8.0.

Additional details and impacted files

@@           Coverage Diff            @@
##           rel-8.0   #18681   +/-   ##
========================================
  Coverage    51.59%   51.59%           
========================================
  Files         3074     3074           
  Lines        97110    97110           
  Branches      7732     7732           
========================================
  Hits         50106    50106           
  Misses       45463    45463           
  Partials      1541     1541           

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