SERVER-37070 Improve duplicate key error messages for all storage engines

src/mongo/db/storage/biggie/biggie_kv_engine.cpp

src/mongo/db/storage/biggie/biggie_sorted_impl.cpp

src/mongo/db/storage/biggie/biggie_sorted_impl.h

src/mongo/db/storage/biggie/biggie_sorted_impl_test.cpp

...rage/ephemeral_for_test/ephemeral_for_test_btree_impl.cpp

...torage/ephemeral_for_test/ephemeral_for_test_btree_impl.h

...ephemeral_for_test/ephemeral_for_test_btree_impl_test.cpp

.../storage/ephemeral_for_test/ephemeral_for_test_engine.cpp

src/mongo/db/storage/mobile/mobile_index.cpp

src/mongo/db/storage/mobile/mobile_index.h

src/mongo/db/storage/mobile/mobile_index_test.cpp

src/mongo/db/storage/sorted_data_interface.h

src/mongo/db/storage/wiredtiger/wiredtiger_index.cpp

src/mongo/db/storage/wiredtiger/wiredtiger_index.h