add tests for api user orgs

[lunny]

Add tests for confirm #5485 and also allow site admin list user's orgs via API even if he is hidden himself on that org.

[codecov-io]

Codecov Report

Merging #5494 into master will increase coverage by 0.06%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master    #5494      +/-   ##
==========================================
+ Coverage   37.57%   37.63%   +0.06%     
==========================================
  Files         317      317              
  Lines       46824    46824              
==========================================
+ Hits        17593    17623      +30     
+ Misses      26732    26699      -33     
- Partials     2499     2502       +3

Impacted Files	Coverage Δ
routers/api/v1/org/org.go	48.85% <100%> (+25.19%)	⬆️
modules/process/manager.go	76.81% <0%> (-4.35%)	⬇️

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