Bugfix, perform SCA only once

[isabellaio]

• Add unit tests

Summary

(What is this feature about)

Checklist for Definition of Done

Depending on the task some of the following jobs are not relevant. Please check the items or cross them out (~~text~~).

• [x] Code is technically reviewed by myself
• [x] Code is manually tested
• [x] Automatic tests for new functionality are created
• [x] Documentation is updated
• [x] Git history is clean

[codecov[bot]]

Codecov Report

Merging #93 into master will decrease coverage by 0.28%. The diff coverage is 59.25%.

@@             Coverage Diff              @@
##             master      #93      +/-   ##
============================================
- Coverage      71.8%   71.51%   -0.29%     
- Complexity      286      289       +3     
============================================
  Files            76       77       +1     
  Lines          1589     1608      +19     
  Branches        109      111       +2     
============================================
+ Hits           1141     1150       +9     
- Misses          386      396      +10     
  Partials         62       62

Impacted Files	Coverage Δ	Complexity Δ
...psd2/sandbox/xs2a/service/domain/ScaException.java	100% <100%> (ø)	1 <1> (?)
...rsys/psd2/sandbox/xs2a/web/RedirectController.java	56.41% <37.5%> (-16.67%)	4 <3> (ø)
...sandbox/xs2a/service/redirect/RedirectService.java	87.87% <88.88%> (+0.37%)	30 <0> (+2)	:arrow_up:

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