test: remove unused deprecation code

Currently there are two tests that specify a third argument, a
deprecation code string, when calling common.expectWarning. The
function only takes two arguments and this third argument is not used.

This commit removes the deprecation code.

PR-URL: #19317
Reviewed-By: Yuta Hiroto <hello@hiroppy.me>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Khaidi Chu <i@2333.moe>
Reviewed-By: Jackson Tian <shyvo1987@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Tobias Nießen <tniessen@tnie.de>

test/parallel/test-process-assert.js

@@ -4,8 +4,7 @@ const assert = require('assert');
 
 common.expectWarning(
   'DeprecationWarning',
-  'process.assert() is deprecated. Please use the `assert` module instead.',
-  'DEP0100'
+  'process.assert() is deprecated. Please use the `assert` module instead.'
 );
 
 assert.strictEqual(process.assert(1, 'error'), undefined);

test/parallel/test-process-env-deprecation.js

@@ -8,8 +8,7 @@ common.expectWarning(
   'DeprecationWarning',
   'Assigning any value other than a string, number, or boolean to a ' +
   'process.env property is deprecated. Please make sure to convert the value ' +
-  'to a string before setting process.env with it.',
-  'DEP0104'
+  'to a string before setting process.env with it.'
 );
 
 process.env.ABC = undefined;