Make Chai PropertyChange argument 'property' optional (#38405)

Chai allows passing a single argument to its increase,
decrease and change tests:

```ts
let y;
expect(() => { y += 1 }).to.increase(() => y);
```

The type definitions of PropertyChange, used by the three
tests mentionds, did not allow passing a single argument.

types/chai/index.d.ts

@@ -379,7 +379,7 @@ declare namespace Chai {
     }
 
     interface PropertyChange {
-        (object: Object, property: string, message?: string): Assertion;
+        (object: Object, property?: string, message?: string): Assertion;
     }
 
     export interface Assert {