minor #32893 [PhpUnitBridge] Polyfill the method createPartialMock (jderusse)

This PR was merged into the 4.4 branch.

Discussion
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[PhpUnitBridge] Polyfill the method createPartialMock

| Q             | A
| ------------- | ---
| Branch?       | 4.4
| Bug fix?      | no
| New feature?  | yes
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | #32844
| License       | MIT
| Doc PR        | NA

Provide a polyfill for `createPartialMock` required by #32885

Commits
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a68c16d844 Polyfill the method createPartialMock

src/Symfony/Bridge/PhpUnit/Legacy/ForwardCompatTestTraitForV5.php

@@ -105,6 +105,26 @@ trait ForwardCompatTestTraitForV5
         return $mock->getMock();
     }
 
+    /**
+     * @param string $originalClassName
+     *
+     * @return MockObject
+     */
+    protected function createPartialMock($originalClassName, array $methods)
+    {
+        $mock = $this->getMockBuilder($originalClassName)
+            ->disableOriginalConstructor()
+            ->disableOriginalClone()
+            ->disableArgumentCloning()
+            ->setMethods(empty($methods) ? null : $methods);
+
+        if (method_exists($mock, 'disallowMockingUnknownTypes')) {
+            $mock = $mock->disallowMockingUnknownTypes();
+        }
+
+        return $mock->getMock();
+    }
+
     /**
      * @param string $message
      *