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Describe the bug
SearchNarrowInterceptor ignored during $lastn operation.

To Reproduce
Steps to reproduce the behavior:

1. Implement SearchNarrowInterceptor
2. Add SearchNarrowInterceptor to interceptors
3. Enable lastn operation
4. Enable hibernate search elasticsearch

Expected behavior
Observation/$lastn operation should narrow result based on SearchNarrowInterceptor implementation

Screenshots

Environment (please complete the following information):

• HAPI FHIR Version 6.4.4

Additional context
During the $lastn operation the OperationType is extended-operation-type which results in a true outcome of the below statement.

public class SearchNarrowingInterceptor {
    ...
    private boolean shouldSkipNarrowing(RequestDetails theRequestDetails) {
        return theRequestDetails.getRestOperationType() != RestOperationTypeEnum.SEARCH_TYPE
                   && !"$everything".equalsIgnoreCase(theRequestDetails.getOperation());
    }

Should the above code include the following statement:

&& !"$lastn".equalsIgnoreCase(theRequestDetails.getOperation());