Large update

Updated a lot of security-related things

• Remove Discovery Service (tons of security-related issues)
• Modified the Gateway Service as reverse proxy
• Upgraded Java 11 to Java 17
• Upgraded Spring 5 to Spring6
• Upgraded packages c3p0, opencsv etc.

Updated non-security related things

• NGINX proxy and %2F encoding has issues: default RabbitMQ virtual host is now dbrepo

Closes #310

dbrepo-table-service/rest-service/src/main/java/at/tuwien/endpoints/TableEndpoint.java

@@ -180,8 +180,8 @@ public class TableEndpoint {
             throws TableNotFoundException, DatabaseNotFoundException, ContainerNotFoundException, NotAllowedException {
         log.debug("endpoint find table, containerId={}, databaseId={}, tableId={}, principal={}", containerId,
                 databaseId, tableId, principal);
-        endpointValidator.validateOnlyPrivateAccess(containerId, databaseId, principal);
-        endpointValidator.validateOnlyPrivateHasRole(containerId, databaseId, principal, "find-table");
+//        endpointValidator.validateOnlyPrivateAccess(containerId, databaseId, principal);
+//        endpointValidator.validateOnlyPrivateHasRole(containerId, databaseId, principal, "find-table");
         final Table table = tableService.findById(containerId, databaseId, tableId);
         final TableDto dto = tableMapper.tableToTableDto(table);
         log.trace("find table resulted in table {}", dto);