[backend] feat(stix): fix tests (#3511)

Author: gabriel-peze

openaev-api/src/test/java/io/openaev/api/stix_process/StixApiTest.java

@@ -956,9 +956,12 @@ void shouldUpdateSecurityCoverageStixModified() throws Exception {
     @DisplayName("Should not remove security coverage even if scenario is deleted")
     void shouldExistSecurityCoverage() throws Exception {
       String scenarioId = getScenarioIdResponse(mapper.writeValueAsString(stixSecurityCoverage));
+      entityManager.clear();
       Scenario scenario = scenarioRepository.findById(scenarioId).orElseThrow();
       String securityCoverageId = scenario.getSecurityCoverage().getId();
+      entityManager.clear();
       scenarioRepository.deleteById(scenarioId);
+      entityManager.clear();
       assertThat(securityCoverageRepository.findByExternalId(securityCoverageId)).isNotNull();
     }