test: define SharedArrayBuffer as a known global

This commit defines SharedArrayBuffer as a global for all tests,
rather than adding comments to individual tests.

PR-URL: #20849
Reviewed-By: Tiancheng "Timothy" Gu <timothygu99@gmail.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>
Reviewed-By: Yuta Hiroto <hello@hiroppy.me>
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Benjamin Gruenbaum <benjamingr@gmail.com>
Reviewed-By: Tobias Nießen <tniessen@tnie.de>

test/.eslintrc.yaml

@@ -51,3 +51,4 @@ globals:
   WebAssembly: false
   BigInt64Array: false
   BigUint64Array: false
+  SharedArrayBuffer: false

test/parallel/test-buffer-sharedarraybuffer.js

@@ -1,4 +1,3 @@
-/* global SharedArrayBuffer */
 'use strict';
 
 require('../common');

test/parallel/test-util-format-shared-arraybuffer.js

@@ -2,7 +2,5 @@
 require('../common');
 const assert = require('assert');
 const util = require('util');
-
-/* global SharedArrayBuffer */
 const sab = new SharedArrayBuffer(4);
 assert.strictEqual(util.format(sab), 'SharedArrayBuffer { byteLength: 4 }');

test/parallel/test-util-types.js

@@ -1,5 +1,4 @@
 // Flags: --harmony-bigint --experimental-vm-modules
-/* global SharedArrayBuffer */
 'use strict';
 const common = require('../common');
 const fixtures = require('../common/fixtures');