test: skip memory usage tests when ASAN is enabled

Running tests with an ASAN build leads to increased memory usage,
rendering the memory usage assumptions in the test invalid.

Refs: nodejs#32776 (comment)

test/parallel/test-crypto-dh-leak.js

@@ -4,6 +4,8 @@
 const common = require('../common');
 if (!common.hasCrypto)
   common.skip('missing crypto');
+if (process.config.variables.asan)
+  common.skip('ASAN messes with memory measurements');
 
 const assert = require('assert');
 const crypto = require('crypto');

test/sequential/test-net-bytes-per-incoming-chunk-overhead.js

@@ -2,6 +2,9 @@
 'use strict';
 
 const common = require('../common');
+if (process.config.variables.asan)
+  common.skip('ASAN messes with memory measurements');
+
 const assert = require('assert');
 const net = require('net');