fix(zone.js): zone.js toString patch should check typeof Promise is function (#38350)

Close #38361

zone.js monkey patch toString, and check the instance is `Promise` or not by using `instanceof Promise`,
sometimes when Promise is not available, the `instanceof` operation fails
and throw `TypeError: Right-hand side of 'instanceof' is not an object`
this PR check `typeof Promise` equals to function or not to prevent the error.

PR Close #38350

packages/zone.js/test/common/toString.spec.ts

@@ -18,6 +18,18 @@ describe('global function patch', () => {
           .toEqual(Function.prototype.toString.call(g[zoneSymbol('setTimeout')]));
     });
 
+    it('should not throw error if Promise is not a function', () => {
+      const P = g.Promise;
+      try {
+        g.Promise = undefined;
+        expect(() => {
+          const a = {}.toString();
+        }).not.toThrow();
+      } finally {
+        g.Promise = P;
+      }
+    });
+
     it('MutationObserver toString should be the same with native version',
        ifEnvSupports('MutationObserver', () => {
          const nativeMutationObserver = g[zoneSymbol('MutationObserver')];