Allowed JWT usage on all endpoints and refactoring

gms/src/main/java/it/inaf/ia2/gms/service/SearchService.java

gms/src/main/resources/sql/init.sql

gms/src/test/java/it/inaf/ia2/gms/GmsTestUtils.java

gms/src/test/java/it/inaf/ia2/gms/authn/SessionDataTest.java

...java/it/inaf/ia2/gms/controller/GroupsControllerTest.java

...inaf/ia2/gms/controller/GroupsTabResponseBuilderTest.java

.../inaf/ia2/gms/controller/JWTWebServiceControllerTest.java

...java/it/inaf/ia2/gms/controller/SearchControllerTest.java

.../inaf/ia2/gms/manager/InvitedRegistrationManagerTest.java

...af/ia2/gms/manager/PermissionsManagerIntegrationTest.java

.../test/java/it/inaf/ia2/gms/persistence/GroupsDAOTest.java

...st/java/it/inaf/ia2/gms/service/GroupNameServiceTest.java

.../test/java/it/inaf/ia2/gms/service/SearchServiceTest.java