_orderedCollections is currently keyed by a std::pair<std::string, UUID>, change it to be keyed by std::pair<TenantDatabaseName, UUID>.

Also, change the related functions on CollectionCatalog that take in a dbName as a string to instead take in TenantDatabaseName.

-CollectionCatalog::iterator https://github.com/mongodb/mongo/blob/e1b81f363ccae3f9892815e5874b9a39665d8ebb/src/mongo/db/catalog/collection_catalog.cpp#L319

- CollectionCatalog::getAllCollectionUUIDsFromDb  https://github.com/mongodb/mongo/blob/e1b81f363ccae3f9892815e5874b9a39665d8ebb/src/mongo/db/catalog/collection_catalog.cpp#L867

- CollectionCatalog::getAllCollectionNamesFromDb https://github.com/mongodb/mongo/blob/e1b81f363ccae3f9892815e5874b9a39665d8ebb/src/mongo/db/catalog/collection_catalog.cpp#L881