fix: make Node.js environment detection robust w.r.t. JSDOM (#6148)

Previously Node.js was detected by the lack of `global.document` which doesn’t work in case JSDOM is being used in Node.js. Instead, we now detect `process.versions.node`, like here: https://github.com/MatthewSH/is-node/commit/426943ae936536f9c2fd10fd58a9a46b59470097#diff-168726dbe96b3ce427e7fedce31bb0bc.

Fixes #6147.

src/environment.ts

@@ -14,4 +14,8 @@
  * limitations under the License.
  */
 
-export const isNode = typeof document === 'undefined';
+export const isNode = !!(
+  typeof process !== 'undefined' &&
+  process.versions &&
+  process.versions.node
+);