[CodeQuality] Add AddStubIntersectionVarToStubPropertyRector

[TomasVotruba]

Adds AddStubIntersectionVarToStubPropertyRector to the mock-to-stub set.

When a test property is typed as a bare native Stub and setUp() assigns it via createStub(), add a @var Stub&MockedClass intersection docblock:

private \PHPUnit\Framework\MockObject\Stub $pathsHelper;

protected function setUp(): void
{
    $this->pathsHelper = $this->createStub(PathsHelper::class);
}

→

/**
 * @var \PHPUnit\Framework\MockObject\Stub&\PathsHelper
 */
private \PHPUnit\Framework\MockObject\Stub $pathsHelper;

Stub analog of AddIntersectionVarToMockObjectPropertyRector. MockObjectPropertyDetector generalized (parametric on class name + create-method) and shared by both rules.

Skips: existing intersection @var, non-test classes, MockObject-typed properties.