Change the applyOps command to act on a DatabaseName object rather than string. Specifically, change applyOps to take in a DatabaseName object, and pass the DatabaseName object to it from the applyOps command (as well as from any other call sites). We will not allow this command to be run by users (so do not override `allowedWithSecurityToken()` or add a test case to native_tenant_data_isolation_basic_security_token.js). We should add a test case to native_tenant_data_isolation_basic_dollar_tenant.js, however.