remove unneeded dsn

Author: AbhiPrasad

MIGRATION.md

@@ -84,9 +84,6 @@ The internal `API` class was removed in favor of explicitly accessing client opt
 // New in v7:
 import { makeDsn } from '@sentry/utils';
 
-const dsn = makeDsn(dsn);
-const dsn = api.dsn;
-
 const client = getCurrentHub().getClient();
 const dsn = client.getDsn();
 const clientOptions = client.getOptions();