Add divider radius tests and update vertical divider

Added a new golden image and test for Divider radius on macOS. Updated vertical divider properties test to include radius and changed thickness. Updated corresponding golden image for vertical divider.

Author: FeodorFitsner

sdk/python/packages/flet/integration_tests/controls/golden/macos/divider/divider_radius.png

@@ -24,3 +24,18 @@ async def test_divider_properties(flet_app: ftt.FletTestApp, request):
             trailing_indent=20,
         ),
     )
+
+
+@pytest.mark.asyncio(loop_scope="module")
+async def test_divider_radius(flet_app: ftt.FletTestApp, request):
+    await flet_app.assert_control_screenshot(
+        request.node.name,
+        ft.Divider(
+            color=ft.Colors.RED,
+            height=40,
+            radius=20,
+            thickness=30,
+            leading_indent=20,
+            trailing_indent=20,
+        ),
+    )

sdk/python/packages/flet/integration_tests/controls/golden/macos/vertical_divider/vertical_divider_properties.png

@@ -37,11 +37,12 @@ async def test_vertical_divider_properties(flet_app: ftt.FletTestApp, request):
     flet_app.page.add(
         ft.VerticalDivider(
             expand=True,
-            thickness=10,
+            thickness=20,
             color=ft.Colors.RED,
             width=100,
             leading_indent=100,
             trailing_indent=100,
+            radius=10,
         )
     )
     flet_app.page.update()