Spring Boot Core: add Integration Test annotation

[pascalgrimaud]

Fix #240

[codecov]

Codecov Report

Merging #241 (be8698a) into main (5072a82) will not change coverage.
The diff coverage is 100.00%.

@@             Coverage Diff             @@
##                main      #241   +/-   ##
===========================================
  Coverage     100.00%   100.00%           
  Complexity       418       418           
===========================================
  Files             75        75           
  Lines           1288      1288           
  Branches          32        32           
===========================================
  Hits            1288      1288           

Impacted Files	Coverage Δ
...pringboot/core/domain/SpringBootDomainService.java	100.00% <100.00%> (ø)

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