OZG-4939 added PR13 comments

pom.xml

...e/ozgcloud/admin/errorhandling/AdminExceptionHandler.java

...zgcloud/admin/security/AdminAuthenticationEntryPoint.java

...ava/de/ozgcloud/admin/security/SecurityConfiguration.java

src/main/resources/application-dev.yaml

src/main/resources/application-remotekc.yaml

src/main/resources/application.yaml

...oud/admin/security/AdminAuthenticationEntryPointTest.java

...ud/admin/security/AuthenticationExceptionTestFactory.java

.../ozgcloud/admin/security/SecurityConfigurationITCase.java

...min/security/SecurityConfigurationWithKeycloakITCase.java

src/test/resources/application.yaml