Spring Boot Common: code smells, define constant

[pascalgrimaud]

Following #540

[codecov]

Codecov Report

Merging #544 (ae730f3) into main (b9f4028) will not change coverage.
The diff coverage is 100.00%.

@@             Coverage Diff             @@
##                main      #544   +/-   ##
===========================================
  Coverage     100.00%   100.00%           
  Complexity       877       877           
===========================================
  Files            160       160           
  Lines           2665      2668    +3     
  Branches          57        57           
===========================================
+ Hits            2665      2668    +3     

Impacted Files	Coverage Δ
...t/common/domain/SpringBootCommonDomainService.java	100.00% <100.00%> (ø)

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