SAK-44216 Messages: Advanced search doesn't work finding by label on other languages (#8924) * SAK-44432 - Added missing init method to the MembershipManagerImpl bean
* SAK-44432 - Added missing serverConfigurationService to the MembershipManagerImpl bean
* SAK-44216 - Searching for a priority label now uses the backend value rather than the display label. Adds a dropdown to the page, similar to the date range. Also added some unit tests to validate results.
* SAK-44216 - remove some unneeded stuff from the test configuration