test: separate WPT console test from other test

Remove one test from test-whatwg-console-is-a-namespace that is not part
of the WPT test. Put it in test-console-self-assign.

PR-URL: #23340
Reviewed-By: Richard Lau <riclau@uk.ibm.com>
Reviewed-By: Sakthipriyan Vairamani <thechargingvolcano@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>

Author: Trott

test/parallel/test-console-self-assign.js

@@ -0,0 +1,6 @@
+'use strict';
+
+require('../common');
+
+// Assigning to itself should not throw.
+global.console = global.console; // eslint-disable-line no-self-assign

test/parallel/test-whatwg-console-is-a-namespace.js

@@ -5,9 +5,6 @@ require('../common');
 const { test, assert_equals, assert_true, assert_false } =
   require('../common/wpt');
 
-// Assigning to itself should not throw.
-global.console = global.console; // eslint-disable-line no-self-assign
-
 const self = global;
 
 /* eslint-disable quotes, max-len */