Merge branch 'permanent-delete' into 'master'

Fix Permanent delete for multiple enrollments

## Purpose
To enable permanent deletion of a sinlge device with multiple enroolmemts

## Goals
> (Goals achieved by feature)

## Approach

## Documentation

## Automation tests

## Security checks
 - Followed secure coding standards? (yes/no)
 - Ran FindSecurityBugs plugin and verified report? (yes/no)
 - Confirmed that this PR doesn't commit any keys, passwords, tokens, usernames, or other secrets? (yes/no)

## Related MRs


## Test environment

## Learning

See merge request entgra/carbon-device-mgt!296

components/device-mgt/org.wso2.carbon.device.mgt.core/src/main/java/org/wso2/carbon/device/mgt/core/service/DeviceManagementProviderServiceImpl.java

@@ -533,10 +533,10 @@ public class DeviceManagementProviderServiceImpl implements DeviceManagementProv
         try {
             DeviceManagementDAOFactory.beginTransaction();
             existingDevices = deviceDAO.getDevicesByIdentifiers(deviceIdentifiers, tenantId);
-            if (existingDevices.size() != deviceIdentifiers.size()) {
             for (Device device : existingDevices) {
                 deviceIdentifiers.remove(device.getDeviceIdentifier());
             }
+            if (!deviceIdentifiers.isEmpty()) {
                 String msg =
                         "Couldn't find device ids for all the requested device identifiers. " +
                                 "Therefore payload should contain device identifiers which are not in the system. " +